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01
01 4MATIC+
Rolling Diameter
is Everything.
Mercedes 4MATIC and 4MATIC+ systems compare front and rear wheel speeds 100 times per second. Put mismatched rolling diameters on an E63S or C63 and the transfer case fights itself on every corner. Every spec here keeps front and rear within the 1% tolerance Mercedes engineering requires.
02
02 Caliper Clearance
AMG Brembos
Need Room.
AMG performance models run front calipers that are physically too large for most aftermarket wheels. A high-spoke design with correct inner diameter clearance isn't optional — it's required. Every forged set we build for AMG applications is designed around the caliper, not as an afterthought.
03
03 Stagger
Stagger Done
Correctly.
AMG GT and C63 Coupé run staggered diameters from the factory. Getting the offset relationship right between front and rear changes how the car rotates — too much rear offset and you push wide, too little and the rear steps out before you're ready. These specs are where aggressive meets predictable.
Step 1
Select Your Chassis
Can't find your model? Contact us directly →
SPORT MODELS
Flowform recommended — best value for performance
AMG PERFORMANCE
Forged wheels only — AMG applications require it
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Bolt Pattern—
Centre Bore—
Thread—
FastenerBolt
Recommended Flush Fitment
Axle
Size
Offset
Tyre
Front
—
—
—
Rear
—
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Flowform Wheels Recommended
This chassis is an ideal candidate for flow-formed construction — motorsport-grade strength at a significantly lower price than full forged. Browse our in-stock range or enquire below for a custom set.
Browse In-Stock Flowform Wheels →CUSTOM FORGED ENQUIRY
Get a quote — specs pre-loaded.
Universal Specification — All Modern Mercedes-Benz
The five numbers every Mercedes wheel fitment starts with
Before offset, diameter, or width — these specifications are fixed across the entire modern Mercedes-Benz lineup. Getting any one of them wrong means the wheel does not go on, does not stay on, or damages the vehicle.
5×112
Bolt Pattern (PCD)
66.6mm
Centre Bore
M14×1.5
Thread Pitch
130 Nm
Lug Bolt Torque
Universal Fitment Constants — Mercedes-Benz
Bolt Pattern5×112 (5 bolts, 112mm PCD)
Centre Bore66.6mm
ThreadM14×1.5
Bolt Seat Type60° Conical (Cone Seat)
Torque Spec130 Nm (96 ft-lb)
Fastener TypeBolt (not nut)
AWD Diameter Tolerance±1.0% front vs rear
Why each number matters
5×112 PCD: The five bolt holes must align precisely with the hub's five studs. An incorrect PCD — even by 2mm — means the wheel physically cannot be mounted without stripping bolts.
66.6mm centre bore: This is the hole that locates the wheel onto the hub spigot. When bore matches hub exactly, load is carried by the hub. When it doesn't, load transfers to the bolts — which are clamping fasteners, not locating components.
M14×1.5 thread / 130 Nm torque: Under-torqueing allows micro-movement that fatigues wheel bolts. Over-torqueing (from impact guns) stretches threads and can crack alloy wheels. Always use a calibrated torque wrench. Re-torque after 50km.
Cone seat bolt: Mercedes uses a conical bolt seat, not a ball seat or flat seat. Aftermarket wheels must specify cone seat compatibility. Using a ball-seat bolt in a cone-seat wheel (or vice versa) produces only partial contact — the bolt can shear under load.
Hub-Centric Fitment
The 66.6mm centre bore — why it's more critical than the bolt pattern
The bolt pattern gets a wheel on the car. The centre bore keeps the wheel centred on the car. These are two different functions, and conflating them is one of the most common — and most dangerous — mistakes in aftermarket wheel fitment.
Hub-centric vs. lug-centric: the engineering difference
A hub-centric fitment is one where the wheel's centre bore matches the hub diameter precisely. The hub spigot physically locates the wheel concentrically — the wheel cannot be mounted off-centre. Wheel bolts then clamp the assembly. In this configuration, dynamic forces (cornering, braking, acceleration) are transmitted through the hub-to-bore interface. Bolts carry only clamping force.
A lug-centric fitment occurs when the centre bore is larger than the hub. The wheel is located by the bolts alone. Under dynamic load, the wheel attempts to move relative to the hub, producing vibration at a frequency related to rotational speed — typically felt as a high-frequency shimmy between 80–120 km/h that does not respond to wheel balancing. Over time, this micro-movement fatigues the wheel bolts and can crack the wheel at the bolt holes.
⚠ Critical
A lug-centric fitment on a high-performance vehicle is not simply a comfort issue — it is a structural safety issue. Bolt fatigue from lug-centric loading has caused wheel separation events. Always verify bore compatibility before mounting.
Centre bore compatibility across European brands
Because Mercedes shares its 5×112 bolt pattern with Audi and Volkswagen Group vehicles, cross-brand fitment attempts are common. The centre bore differences between platforms make most of these incompatible:
Centre Bore by Brand / Platform
Mercedes-Benz (all)66.6mm
Audi B9/C8 (A4, A5, A6, A7, A8, Q5, Q7)66.5mm
Audi 8V/8Y (A3, S3, RS3, TT)57.1mm
Audi R8 (4S)57.1mm
Volkswagen Golf / Polo57.1mm
Porsche 911 (992)71.6mm (different PCD: 5×130)
A 57.1mm-bore wheel cannot fit a 66.6mm Mercedes hub — the hub spigot is larger than the bore. A 66.5mm Audi B9 wheel technically fits the 66.6mm Mercedes hub but sits 0.05mm loose — not genuinely hub-centric. A hub ring is required even for this near-match.
Hub ring specification
Most universal aftermarket wheels are manufactured with a 73.0mm or 74.1mm centre bore to accommodate multiple hub sizes. For Mercedes fitment, you need rings that reduce from your wheel's bore to 66.6mm. Rings should be machined from 6061-T6 aluminium alloy — not plastic. Aluminium rings maintain their dimension under the thermal cycling of repeated braking; plastic rings can deform above 100°C, which brake heat easily reaches on AMG models.
Offset Engineering
ET offset explained — and why the correct value differs for every Mercedes model
ET stands for Einpresstiefe — German for "press-in depth." It is the distance in millimetres from the wheel's mounting face to its geometric centreline. A positive ET means the mounting face sits outboard of centre (toward the street side); a negative ET means it sits inboard. Zero ET means the mounting face aligns exactly with the wheel's centreline.
ET Relationship to Wheel Position
Outboard clearance = (wheel width ÷ 2) − ET
Inboard clearance = (wheel width ÷ 2) + ET
Example: 19×8.5 at ET38 → Outboard = (215.9 ÷ 2) − 38 = 69.95mm from hub face to outer edge
Inboard = (215.9 ÷ 2) + 38 = 145.95mm from hub face to inner edge
Inboard = (215.9 ÷ 2) + 38 = 145.95mm from hub face to inner edge
How ET affects stance on Mercedes bodywork
Mercedes-Benz arch lips have a fixed position relative to the hub centreline on each model. The "flush" offset is the ET at which the tyre's outer shoulder aligns with or sits fractionally proud of that arch lip. On a W205 C-Class with standard bodywork, that point is approximately ET38 on a 19×8.5 wheel.
Every 5mm reduction in ET pushes the wheel 5mm further outboard. On a standard C-Class, reducing from ET38 to ET28 moves the tyre 10mm past the arch lip — visible as a protrusion beyond the bodywork that technically requires arch modification to be road legal in most Australian states.
Every 5mm increase in ET tucks the wheel 5mm inboard. Running ET48 on a C-Class moves the tyre 10mm inside the arch, breaking the flush bodywork plane and creating a visually recessed, factory-stock appearance.
Scrub radius and its effect on steering
Scrub radius is the distance between the centre of the tyre contact patch and the point where the steering axis (the line through the upper and lower ball joints or strut axis) intersects the road surface.
Mercedes engineers design a specific scrub radius for each platform to achieve the desired steering feedback and self-centring behaviour. Changing offset changes scrub radius:
- Lower ET (wheel moves out): Increases positive scrub radius. Creates kickback under braking on uneven surfaces. Amplifies torque steer on front-wheel-drive or AWD models.
- Higher ET (wheel moves in): Reduces or reverses scrub radius. Causes the steering to self-centre aggressively. Can produce nervous turn-in behaviour.
- ±10mm from factory: Generally maintains scrub radius within acceptable tolerance for street driving on Mercedes-Benz platforms.
- AMG Sport Suspension: Stiffer spring rates amplify the effect of scrub radius changes — offset selection is more critical on AMG than on standard Mercedes variants.
ET
The C-Class flush offset — 19×8.5 ET38 — and the physics behind why it works
On a W205 C-Class with standard bodywork, ET38 on a 19×8.5 wheel positions the tyre shoulder 69.95mm outboard of the hub face. The W205's front arch lip sits approximately 70–72mm outboard of the hub face, placing the tyre precisely at arch-lip level. This is the flush plane. Stagger to ET25 and the tyre protrudes 22mm beyond the arch — requiring rolled lips or arch spacers for legality.
All-Wheel-Drive Compatibility
4MATIC+ rolling diameter — the 1% rule that protects your drivetrain
Mercedes 4MATIC+ is the most sophisticated mass-market AWD system currently in production. It uses continuous hydraulic torque vectoring to distribute drive force between axles and individual wheels. It is also the most unforgiving system in the market when tyre rolling diameters are mismatched.
How 4MATIC+ detects slip
The 4MATIC+ transfer case compares rotational velocity across all four wheel-speed sensors hundreds of times per second. Its core logic assumes that, on a straight road at constant speed with no wheelspin, all four wheels rotate at the same speed. The system uses deviations from this baseline to detect and respond to wheel slip.
If the front tyres have a different rolling circumference than the rear tyres — which occurs whenever front and rear rolling diameters differ — the front wheels rotate at a different speed than the rears even on a perfectly straight, dry road with no slip occurring. The system cannot distinguish this false positive from genuine slip. It responds by continuously adjusting torque distribution, which:
- Generates constant heat in the transfer case and rear differential
- Accelerates clutch pack wear in the multi-plate AWD coupling
- Triggers drivetrain protection modes that limit torque
- In severe cases, causes transfer case failure within 30,000–50,000km
Calculating rolling diameter correctly
Rolling Diameter Formula
Section Height = Tyre Width × Aspect Ratio ÷ 100
Rolling Diameter = (Rim Diameter × 25.4) + (2 × Section Height)
275/30R20 → SH = 275 × 0.30 = 82.5mm
RD = (20 × 25.4) + (2 × 82.5) = 508 + 165 = 673mm
RD = (20 × 25.4) + (2 × 82.5) = 508 + 165 = 673mm
Percentage Difference Formula (must be < 1.0%)
Diff % = ((Larger RD − Smaller RD) ÷ Smaller RD) × 100
305/25R20 → SH = 76.25mm → RD = 508 + 152.5 = 660.5mm
Diff = ((673 − 660.5) ÷ 660.5) × 100 = 1.89% — FAIL
Diff = ((673 − 660.5) ÷ 660.5) × 100 = 1.89% — FAIL
Rolling diameter compatibility reference — common Mercedes staggered pairings
The following table shows whether common front/rear tyre pairings are within the Mercedes 4MATIC+ 1% rolling diameter tolerance. Calculate both diameters before finalising any staggered tyre selection on a 4MATIC-equipped model.
| Front Tyre | Front RD | Rear Tyre | Rear RD | Difference | 4MATIC+ Status |
|---|---|---|---|---|---|
| 255/35R20 | 660mm | 285/30R20 | 658mm | 0.3% | ✓ Pass |
| 255/35R20 | 660mm | 295/30R20 | 660mm | 0.0% | ✓ Pass |
| 275/30R20 | 673mm | 305/30R20 | 680mm | 1.0% | ✓ Borderline |
| 275/30R20 | 673mm | 305/25R20 | 661mm | 1.8% | ✗ Fail |
| 245/35R19 | 638mm | 245/35R19 | 638mm | 0.0% | ✓ Pass (square) |
| 235/35R20 | 650mm | 265/35R20 | 660mm | 1.5% | ✗ Fail |
| 255/35R20 | 660mm | 275/35R20 | 670mm | 1.5% | ✗ Fail |
| 265/35R20 | 660mm | 295/30R20 | 660mm | 0.0% | ✓ Pass |
⚠ Important
Rolling diameters in the table above are calculated values. Actual rolling diameter varies by tyre brand and may differ by ±2–4mm from calculated values. Always cross-reference with tyre manufacturer load-inflation tables for final verification on 4MATIC+ models. On RWD-only AMG models (AMG GT, standard C63 without 4WD), rolling diameter tolerance does not apply.
AMG Performance Brakes
AMG Brembo caliper clearance — the most common fitment failure on AMG models
AMG Performance Brakes are among the largest production brake systems fitted to any road car. The front caliper on a C63S AMG is a 6-piston Brembo monoblock — physically large, positioned close to the inner barrel of the wheel. Most aftermarket wheels are not designed around these calipers.
⬡
Spoke geometry — the primary clearance variable
Caliper clearance is not simply a function of wheel diameter. A 20-inch wheel with five thick spokes positioned at the 12, 3, 6, 9, and additional positions can contact a C63S caliper if the spokes pass close to the caliper body at the 3 and 9 o'clock positions. A 10-spoke design with thinner spokes provides more clearance at those positions. This is why spoke geometry must be evaluated on an individual wheel basis — diameter alone does not guarantee clearance.
○
Minimum diameter requirements by AMG variant
C63S AMG (W205): 18-inch minimum front. With optional AMG Carbon Ceramic Brakes: 19-inch minimum. E63S AMG (W213): 19-inch minimum front. A45S AMG (W177): 18-inch minimum but 19-inch recommended due to tight inner clearance geometry. S63 AMG (W222): 20-inch minimum front. AMG GT (C190): 20-inch minimum front, 21-inch minimum rear. These are physical minimums — spoke clearance must still be independently verified.
△
A45S AMG — the compact car with the big brake problem
The A45S AMG presents the tightest caliper clearance challenge in the current Mercedes lineup. Its front brakes are large relative to the vehicle's compact platform, and the wheel packaging envelope is smaller than on C-Class and above. High spoke count (10+) or radial spoke geometry is strongly recommended. A physical fitment check — placing the wheel against the caliper before mounting — is not optional on A45S AMG.
WWC Fitment Process
Every AMG wheel order placed through WWC is cross-referenced against caliper clearance data for that specific model and year. We do not ship AMG fitments without confirming spoke clearance. If you're ordering independently, ask your supplier for a 3D caliper clearance simulation or bring your wheel to a workshop for a physical check-fit before tyre mounting.
Construction Science
Forged vs. flowform vs. cast — what the manufacturing process actually changes
The construction method of a wheel determines its grain structure, which determines its mechanical properties — strength, fatigue resistance, and weight. These are not marketing distinctions. They are measurable, testable material properties.
AMG Performance — Required
Forged
- Solid aluminium billet compressed under 5,000–10,000 tonnes of press force at elevated temperature
- Grain structure aligned through compression — no discontinuities, no porosity
- Tensile strength 30–50% higher than equivalent cast alloy of same composition
- Fatigue life under cyclic load 2–4× longer than cast
- Survives repeated AMG track heat cycles without microcracking
- Typically 2–4kg lighter per corner vs comparable cast
- Custom offset achievable without compromising structural integrity
- Required: C63S, E63S, A45S, S63, AMG GT
Sport Models — Optimal
Flowform
- Cast core blank spun under heat and pressure by rollers against mandrel
- Barrel compressed and grain-aligned — spoke area remains cast
- Barrel tensile strength approaches forged-level material properties
- Better impact resistance than standard cast — less likely to crack on kerb strikes
- 1.5–3kg lighter per corner than equivalent gravity-cast wheel
- Lower unit cost than forged — significant saving on non-AMG models
- Available in wide diameter and offset ranges for Mercedes platform fitment
- Recommended: C-Class W205 (non-AMG), E-Class W213 (road use)
Not Recommended
Standard Cast
- Molten aluminium poured into mould and cooled — porosity common in heavier sections
- Random grain structure — no directional strength improvement
- Lowest tensile strength and fatigue life of any construction method
- Heaviest per unit of structural strength
- Not suitable for AMG caliper heat duty cycles
- Higher risk of cracking under kerb impacts
- Acceptable for daily OEM replacements on base-spec models only
- WWC does not supply cast wheels for any Mercedes application
2–4kg
Unsprung mass reduction — why the weight saving matters more than it looks
Unsprung mass is the mass of components below the suspension — wheels, tyres, brake rotors, and uprights. Unlike sprung mass (the car body), unsprung mass must be accelerated up and down with every road surface undulation. Reducing unsprung mass by 2kg per corner gives the dampers and springs less inertia to overcome, improving suspension tracking speed. On a C63S AMG with AMG Performance Suspension, this translates to a measurable improvement in high-frequency body control and steering response — particularly on imperfect road surfaces above 100 km/h.
Mercedes Design Language
How Mercedes engineers their stance — and what aftermarket wheels must respect
Mercedes-Benz designs every body panel's arch line in relation to the factory wheel diameter and offset. The visual language of each model — from the pinched haunch of the C-Class to the widened quarters of the AMG GT — is calibrated against specific wheel dimensions.
The factory design envelope
Mercedes designers work with what is called the "tyre envelope" — the maximum three-dimensional space a tyre can occupy at full steering lock and full suspension travel without contacting body panels, suspension components, or brake lines. This envelope defines the outer boundary of allowable fitment.
Inside that boundary, the visual target is the "flush plane" — the point at which the tyre's outer sidewall face aligns with the arch lip. On a W205 C-Class, the flush plane sits at approximately ET38 on a 19×8.5 wheel. On the AMG GT, factory stagger already positions the rear tyre at the extreme outer edge of the envelope — there is almost no additional outward movement possible without bodywork modification.
Why AMG wide body arches exist
The C63S AMG (W205) and E63S AMG (W213) are fitted with wider rear arch panels than their non-AMG siblings. These wider arches serve two functions: they accommodate the wider rear track (approximately 30mm wider than non-AMG), and they allow the AMG-specified wheel offset to achieve a flush position within the bodywork plane. Without the wider arches, the C63S's correct wheel specification would protrude well beyond the body.
This is why fitting C63S AMG wheel offsets to a standard C-Class body causes arch protrusion — the lower ET that fills the C63's wider arches pushes the tyre past the standard C-Class arch lip.
Concave profiles on Mercedes platforms
Concave wheel profiles — where the face of the wheel is recessed inward, creating the appearance of depth and dish — are particularly effective on Mercedes AMG models for two reasons:
Wide rear track creates inner clearance: The wide rear stance of the C63S, E63S, S63, and AMG GT creates substantial inner clearance between the wheel barrel and the brake/suspension components. This clearance enables deep concave profiles that wouldn't be possible on narrower platforms.
Mercedes spoke architecture: AMG factory wheels use multi-spoke radial designs that complement the depth effect of concave profiles. Aftermarket monoblock forged wheels in high-spoke configurations (10–12 spokes) create the most pronounced concave depth on AMG applications.
The AMG GT (C190) is the extreme example: a 21×11.5 rear wheel at ET65 means the wheel is 11.5 inches (292mm) wide, with 65mm of the centreline sitting outboard of the hub face. The inner clearance depth on this fitment is among the greatest of any production car — enabling concave profiles that approach track-car levels of depth.
Design Principle
A correctly fitted aftermarket wheel should make the tyre arch look like it was designed for that wheel — not as though the wheel was shoehorned into a body that wasn't built for it. Correct offset achieves this. Incorrect offset — in either direction — breaks it.
Model-by-Model Reference
Complete flush fitment specifications — all current Mercedes-Benz and AMG platforms
The specifications below represent the flush fitment target for each model with standard factory bodywork. "Flush" is defined as the tyre's outer face aligning with or sitting fractionally (0–5mm) proud of the arch lip at ride height, with the vehicle at standard ride height. Aggressive fitments beyond these specifications require arch modification and may affect road legality.
| Model | Chassis | Years | Front Wheel | Front Offset | Front Tyre | Rear Wheel | Rear Offset | Rear Tyre | CB | Type |
|---|---|---|---|---|---|---|---|---|---|---|
| C-Class | W205 | 2014–2021 | 19×8.5 | ET38 | 235/35R19 | 19×8.5 | ET38 | 235/35R19 | 66.6mm | Flowform |
| E-Class | W213 | 2017–2023 | 20×9.0 | ET30 | 255/35R20 | 20×10.0 | ET40 | 285/30R20 | 66.6mm | Flowform |
| C63S AMG Coupé | W205 | 2014–2021 | 19×9.5 | ET25 | 265/30R19 | 20×10.5 | ET35 | 295/30R20 | 66.6mm | Forged |
| C63S AMG Sedan | W205 | 2014–2021 | 19×9.0 | ET32 | 255/35R19 | 20×10.0 | ET55 | 285/30R20 | 66.6mm | Forged |
| E63S AMG | W213 | 2017–2023 | 20×10.0 | ET20 | 275/30R20 | 20×11.0 | ET48 | 305/25R20 | 66.6mm | Forged |
| A45S AMG | W177 | 2019–2025 | 19×9.0 | ET42 | 245/35R19 | 19×9.0 | ET42 | 245/35R19 | 66.6mm | Forged |
| S63 AMG | W222 | 2013–2020 | 21×9.0 | ET35 | 255/35R21 | 21×10.5 | ET45 | 285/30R21 | 66.6mm | Forged |
| AMG GT | C190 | 2015–2023 | 20×9.5 | ET55 | 265/30R20 | 21×11.5 | ET65 | 305/30R21 | 66.6mm | Forged |
All models: PCD 5×112 · Thread M14×1.5 · Torque 130 Nm · Bolt seat 60° conical. Specifications apply to factory standard bodywork. Wide body, air suspension lowering, and aftermarket arch modification may alter these targets.
Platform Analysis
Model-specific fitment notes — what makes each Mercedes unique
W205 · 2014–2021
C-Class (non-AMG)
Square 19×8.5 ET38 is the proven flush spec on standard bodywork. The C-Class W205 runs conservative factory dimensions — the arch envelope comfortably accommodates an 8.5-inch wheel but begins to run tight at 9.0-inch width. Running ET below 30 on a standard C-Class body will protrude past the arch lip. Flowform recommended for street use — the 4-cylinder and 6-cylinder engines do not generate torque levels requiring forged construction.
Flush Front19×8.5 ET38
Flush Rear19×8.5 ET38
Tyre Size235/35R19
RecommendedFlowform
W205 · 2014–2021
C63S AMG
Coupé and Sedan have different optimal offsets — they are not interchangeable. Coupé uses ET25 front to fill its wider arch opening; Sedan uses ET32 front due to narrower body. The Sedan rear runs ET55 — unusually high — due to W205 Sedan's rear suspension geometry pulling the wheel further inboard than the Coupé equivalent. Forged mandatory. Both C63S variants have 6-piston front Brembo calipers requiring 18-inch minimum; 19-inch+ recommended for adequate spoke clearance.
Coupé Front19×9.5 ET25
Coupé Rear20×10.5 ET35
Sedan Front19×9.0 ET32
Sedan Rear20×10.0 ET55
W213 · 2017–2023
E-Class (4MATIC)
The W213 uses width stagger — 9.0 front / 10.0 rear — with both axles on 20-inch diameter. This is compatible with 4MATIC+ provided tyre sizes keep rolling diameters within 1%. The reference pairing: 255/35R20 front (660mm RD) and 285/30R20 rear (658mm RD) — a 0.3% difference, within tolerance. Flowform is the correct choice for non-AMG E-Class road use.
Front20×9.0 ET30
Rear20×10.0 ET40
RD CheckRequired (4MATIC+)
RecommendedFlowform
W213 · 2017–2023
E63S AMG
One of the most aggressive flush specs in the Mercedes lineup: 20×10.0 ET20 front, 20×11.0 ET48 rear. The front ET20 combined with 10-inch width places the tyre deep in the front arch — the E63S's factory widebody accommodates this. The rear's ET48 is high for an 11-inch-wide wheel, but the W213's rear geometry demands it. Deep concave profiles work exceptionally well given the inner clearance. Rolling diameter critical for 4MATIC+ system — 305/25R20 rear does not pair safely with 275/30R20 front.
Front20×10.0 ET20
Rear20×11.0 ET48
ConstructionForged Only
Min Diameter19" front
W177 · 2019–2025
A45S AMG
Square setup — 19×9.0 ET42 front and rear — on the most compact AMG in the lineup. The A45S's challenge is its front caliper clearance. The front brakes are large relative to the car's smaller platform. High spoke count or wide-spoke radial designs are required. Forged mandatory — the A45S generates 285kW from a 2.0-litre inline-four, producing high-frequency torque pulses that fatigue cast wheels over time. Hub-centric fitment must be verified — no lug-centric shortcuts on this model.
Front19×9.0 ET42
Rear19×9.0 ET42
PriorityCaliper Clearance
ConstructionForged Only
W222 · 2013–2020
S63 AMG
The S63 AMG's wide, long body provides substantial inner and outer clearance — one of the most forgiving fitment envelopes in the Mercedes lineup. 21×9.0 ET35 front, 21×10.5 ET45 rear. The luxury-performance brief makes concave monoblock forged profiles particularly effective — deep dish in the rear especially. Air suspension on most S63 variants means ride height is adjustable — fitment is typically calculated at static ride height.
Front21×9.0 ET35
Rear21×10.5 ET45
SuspensionAir (adjustable)
ConstructionForged Only
C190 · 2015–2023
AMG GT — the extreme stagger case
The AMG GT (C190) runs the most extreme factory stagger of any current Mercedes model: 20×9.5 ET55 front with 265/30R20, and 21×11.5 ET65 rear with 305/30R21. A full diameter step — 20 front, 21 rear. An 11.5-inch rear width. The ET65 rear offset is very high for that width, placing the mounting face 65mm outboard of centre — this is a consequence of the C190's rear mid-engine layout requiring significant suspension packaging clearance on the inner wheel face. The deep inner clearance this creates makes the AMG GT the single best Mercedes platform for extreme concave profiles. No 4MATIC+ rolling diameter concern — the AMG GT is rear-wheel-drive. Forged mandatory. There is no argument for flowform or cast construction on this platform.
Front20×9.5 ET55 · 265/30R20
Rear21×11.5 ET65 · 305/30R21
DrivetrainRWD — no rolling diameter restriction
ConstructionForged Only — No Exceptions
Before You Order
The complete Mercedes wheel fitment verification checklist
Run through every item before finalising a wheel order on any Mercedes-Benz. Missing any single item can result in a wheel that does not physically mount, creates safety-critical vibration, damages the drivetrain, or fails at speed.
Physical Fitment
- Bolt pattern confirmed as 5×112 for your specific model and year
- Centre bore of wheel ≥ 66.6mm (hub rings ordered if bore > 66.6mm)
- Hub rings are aluminium alloy — not plastic
- Bolt seat type is 60° conical — confirmed with wheel supplier
- Bolt length verified for wheel stack height (standard or extended bolts required?)
- If using spacers: extended bolts sourced, spacer is hub-centric to 66.6mm
- Offset (ET) within fitment envelope for your specific body style and year
- Wheel width within tyre width recommendations for chosen tyre size
AMG & AWD-Specific
- If AMG: wheel diameter meets minimum caliper clearance requirement
- If AMG: spoke geometry checked against caliper body — physical fit test recommended
- If 4MATIC or 4MATIC+: rolling diameter of front and rear tyres calculated
- If 4MATIC or 4MATIC+: rolling diameter difference confirmed ≤ 1.0%
- If staggered diameter setup: model confirmed as RWD (not AWD)
- Torque wrench calibrated — set to 130 Nm for all Mercedes wheel bolts
- Re-torque scheduled for 50km after fitment
- TPMS sensors transferred or new sensors sourced for aftermarket wheels
Frequently Asked Questions
Mercedes wheel fitment — direct answers to specific questions
What bolt pattern does Mercedes-Benz use?
All modern Mercedes-Benz passenger cars and AMG models use a 5×112 bolt pattern — five bolts on a 112mm pitch circle diameter. This has been the standard across the Mercedes lineup since the late 1990s and applies to all current models including A-Class, C-Class, E-Class, S-Class, AMG GT, and all AMG variants.
The 5×112 pattern is also used by Audi, Volkswagen Group, and some Porsche models — but centre bore and offset specifications differ between these brands. Cross-brand fitment requires individual verification of bore and offset before any attempt at mounting.
What is the lug bolt torque for Mercedes-Benz wheels?
The factory-specified torque for Mercedes-Benz wheel bolts is 130 Nm (96 ft-lb). This applies to the vast majority of modern Mercedes-Benz and AMG passenger models. Always use a calibrated torque wrench. Torque in a star pattern: tighten in two passes — first to approximately 60 Nm, then to the full 130 Nm specification. This ensures even seating of the wheel against the hub face.
Re-torque is mandatory after the first 50km of driving following any wheel change. Wheel bolts can seat slightly in the first few kilometres, reducing clamping force below specification. This applies to both new wheels and re-mounted original wheels. Impact guns should be used only for initial running of bolts — never for final torqueing.
What centre bore do Mercedes-Benz wheels require?
Mercedes-Benz uses a 66.6mm centre bore across its entire modern passenger car lineup. Most quality aftermarket wheels are manufactured with a larger bore (typically 73.0mm or 74.1mm) to be compatible across multiple vehicle makes. When fitting such wheels to Mercedes, you must use precision hub-centric rings to reduce the bore to 66.6mm.
Hub rings should be made from machined 6061-T6 aluminium alloy. Plastic rings are not acceptable for AMG or high-performance Mercedes applications — brake heat above 100°C can cause plastic rings to deform and lose their locating function. Aluminium rings maintain dimensional stability at operating temperatures and do not corrode into the hub or wheel bore.
Can I put Audi wheels on my Mercedes-Benz?
The 5×112 bolt pattern is shared, but centre bores differ significantly. Audi A3/S3/RS3 and TT models use 57.1mm — this wheel cannot physically mount on a 66.6mm Mercedes hub. The hub spigot is larger than the wheel bore. Audi B9/C8 models (A4, A5, A6, RS4, RS5, RS6) use 66.5mm — technically 0.1mm smaller than the Mercedes 66.6mm hub. This 0.1mm gap means the Audi wheel is not hub-centric on the Mercedes hub, though it will physically mount.
Beyond the bore question, offset (ET) specifications typically differ significantly between Audi and Mercedes platforms. A direct swap is unlikely to achieve correct clearance and flush positioning simultaneously. Attempting it without individual calculation and verification is not recommended.
Why is my Mercedes vibrating after fitting new wheels — wheel balance doesn't fix it?
A high-frequency vibration that appears at speed and does not respond to repeated wheel balancing is typically caused by a lug-centric fitment — the wheel's centre bore is larger than the Mercedes hub, and hub-centric rings were not used. In this situation, the wheel is located by the bolts rather than the hub spigot. Under dynamic load, micro-movement occurs between the wheel and hub face, creating vibration that cannot be balanced out because the balance itself shifts as the wheel moves.
The fix is to remove the wheels, fit correctly-sized aluminium hub-centric rings (66.6mm inner diameter), re-mount and re-torque to 130 Nm, and re-balance. If vibration persists after hub-centric rings are fitted, check that the rings are seated properly and that the wheel face is seating fully against the hub — contamination (paint, rust, debris) on either face will prevent full seating and can also cause vibration.
How do I know what offset to use on my Mercedes?
Offset selection depends on four things: your model (each has a specific arch envelope), your body style (Coupé arches differ from Sedan arches on the same platform), the wheel width you're running, and your target stance (flush, tucked, or aggressive). The specifications in the table above represent the flush target for each model at factory-standard bodywork.
As a working principle: higher ET (e.g. ET45) tucks the wheel inward; lower ET (e.g. ET25) pushes it outward toward the arch lip. For every 5mm of ET reduction, the wheel moves 5mm outboard. On most Mercedes C-Class and E-Class platforms, staying within ±8mm of the flush ET specification keeps the fitment within the legal arch envelope and within acceptable scrub radius tolerance for steering behaviour.
Do I need forged wheels for track use on my Mercedes AMG?
Yes, forged wheels are required for track use on AMG models. Track use combines three factors that standard cast alloys are not designed to handle repeatedly: extreme torque events (launch control, hard acceleration), high brake temperatures (repeated heavy braking transfers caliper heat into the wheel barrel), and sustained structural load (sustained cornering g-force over many laps).
Cast alloy wheels develop microscopic fatigue cracks in the barrel and spoke roots over repeated thermal cycling — especially when subjected to the caliper proximity of AMG Performance Brakes. Forged wheels have a grain structure that resists crack propagation. For occasional track days on standard sport suspension, flowform may be acceptable on non-AMG models. For dedicated track use or any AMG variant, forged is not optional.
What happens if I run mismatched tyre rolling diameters on a 4MATIC+ Mercedes?
The Mercedes 4MATIC+ system will interpret the permanent speed differential between front and rear axles as wheel slip. Consequences include: constant torque redistribution generating heat in the transfer case and rear differential clutch packs; accelerated wear of the AWD coupling; possible activation of drivetrain protection modes that limit available torque; and in severe long-term cases, transfer case failure. Mercedes-Benz dealer workshops have documented transfer case damage attributable to running mismatched tyre diameters on 4MATIC+ models.
The 1% tolerance means: if your front tyres have a rolling diameter of 660mm, your rear tyres must have a rolling diameter between 653.4mm and 666.6mm. Anything outside this range should not be run on a 4MATIC+ vehicle.
What size tyres fit a 20×10.0 wheel correctly?
A 20×10.0 wheel (254mm internal barrel width) correctly accommodates tyres with a section width between approximately 265mm and 305mm. Running a tyre narrower than 255mm on a 10-inch wheel risks the tyre bead not seating fully — particularly under cornering lateral load. Running wider than 315mm risks the tyre bulging excessively over the rim edge, which reduces cornering stability and increases kerb strike damage risk.
For the E63S AMG front fitment at 20×10.0 ET20, the specified tyre is 275/30R20. This is a correctly proportioned pairing — 275mm section width on 254mm (10-inch) internal width produces the appropriate sidewall profile for the intended performance use. A 265/35R20 also fits the rim but has a higher section height that changes rolling diameter — verify rear tyre selection for 4MATIC+ compatibility before finalising.
What is the difference between a 5×112 bolt pattern and a 5×114.3?
The numbers describe the five bolt holes' arrangement: 5 bolts, and the diameter of the circle (PCD) they sit on. 5×112 means the five bolts are arranged on a 112mm diameter circle — this is the European standard used by Mercedes-Benz, Audi, Volkswagen Group, and BMW (which uses 5×120). 5×114.3 (equivalent to 5×4.5 in imperial measurement) is the Japanese/American standard used by Honda, Toyota, Mazda, Ford, and many others.
These bolt patterns are not interchangeable. The 2.3mm difference in PCD diameter means a 5×114.3 wheel mounted on a 5×112 hub would require three bolts at an angle and two bolts unable to thread properly — creating an extremely dangerous situation where the wheel is not secured. Never attempt to cross-fit 5×112 and 5×114.3 wheels, even with adapters not specifically engineered for the application.
Can I use wheel spacers on my Mercedes 4MATIC+ to achieve a flush fitment?
Bolt-on hub-centric spacers in modest sizes (5–15mm) are commonly used on Mercedes 4MATIC+ vehicles and do not affect the AWD system's rolling diameter tolerance — a spacer does not change tyre diameter or rolling circumference. However, several conditions apply: the spacer must be hub-centric to 66.6mm; extended wheel bolts of the correct length must be used (original bolt length minus spacer thickness plus minimum 1.5× bolt diameter engagement — typically 12–14mm thread engagement minimum); and the spacer must be torqued correctly on both the hub face and wheel mounting face.
WWC's professional recommendation is to select the correct wheel offset in the first instance rather than using spacers as a correction. A purpose-built forged wheel at the correct offset will outperform a spacer solution in terms of structural integrity, weight, and long-term reliability.
WWC — Mercedes Wheel Specialists
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