Quick answer: An Audi RS forged wheel should be approved from the exact model generation, axle and brake package—not from a generic “Audi 5×112” listing. Offset and width set the wheel position, while the inner barrel and spoke back profile determine whether the caliper clears. Deep concavity is therefore an engineering outcome, not a styling option that can be applied equally to every RS front and rear fitment.
Why Audi RS Fitment Needs More Than Diameter and PCD
RS models combine performance brake packages, wide tires and model-specific body envelopes. The same nominal diameter may be built with different barrel sections, mounting-pad positions and spoke profiles. A wheel that bolts to the hub can still be unsuitable if it interferes with the caliper, suspension or body—or if its load/document scope does not match the application.
| Input | What it controls | Evidence to send |
|---|---|---|
| Model and generation | Base vehicle geometry and fitment family | Year, model, chassis/platform code and market |
| Brake package | Radial barrel and axial spoke clearance | Brake code, caliper type, template, scan or approved measurements |
| Diameter and width | Rim/tire envelope | OE reference plus target front/rear sizes |
| Offset (ET) | Inner clearance and outer stance | OE ET, target ET and measured body/suspension margin |
| Center bore and hardware | Hub centering and clamping interface | Verified bore, bolt thread, seat and length |
| Load/test scope | Application and market evidence | Axle/vehicle requirement and destination-market document list |
Brake Clearance Has Two Main Zones
1. Radial clearance inside the barrel
The inner barrel must clear the outer radius of the brake caliper and related components. Nominal wheel diameter does not fully describe the usable inner barrel because drop-center and barrel profiles vary.
2. Axial clearance behind the spokes
The caliper projects outward from the hub face. The spoke back, hub pad and transition areas must clear that projection throughout rotation. A face rendering cannot verify this; use a section drawing or 3D clearance check.
Ask the supplier to identify the minimum designed clearance and the data source used. Do not invent a universal clearance number across different wheel, brake and operating conditions.
How Offset Changes More Than Stance
Offset is the distance between the rim centerline and mounting face. Changing ET moves the rim relative to the vehicle, but it also changes how much space is available to shape the spokes and mounting pad. A lower ET may allow a deeper visual face but can increase outer position; a higher ET can pull the wheel inward and reduce suspension or caliper room.
Use the ET-to-backspacing calculator to compare positions. Then validate the result with tire section width, suspension travel, steering lock and body clearance.
Concavity Strategy for Front and Rear Axles
| Strategy | When it can work | What to verify |
|---|---|---|
| Matched face profile | Square setups with compatible brake and offset envelopes | Front caliper usually sets the stricter spoke-back requirement |
| Deeper rear profile | Staggered width/offset provides more face depth | Front/rear visual consistency and tire rolling dimensions |
| Brake-priority front profile | Large front caliper requires additional spoke relief | Minimum clearance, pad thickness and target mass |
| One design across several RS models | Brand wants a family appearance | Each model/generation still needs its own controlled fitment |
Tire and Drivetrain Considerations
For square or staggered packages, select tire sizes according to the vehicle and tire manufacturers’ permitted load, speed, diameter and rim-width ranges. Do not use styling alone to choose front/rear rolling dimensions. The wheel specification, tire package, TPMS and vehicle-control systems must be considered together.
Audi RS Drawing Approval Checklist
- Match the drawing to model, year, generation, trim, axle and brake package.
- Confirm PCD, center bore, bolt-seat geometry and hardware.
- Confirm front/rear diameter, width and signed ET values.
- Review radial barrel clearance and axial spoke/caliper clearance.
- Check inner suspension and outer body position at steering and suspension travel.
- Confirm tire sizes, load/speed requirements and TPMS compatibility.
- Confirm wheel load, market/test documents and permanent markings.
- Approve finish, logo, center cap and drawing revision.
Fitment Information That Makes a Quote Faster
- Exact Audi RS model, year, generation/platform and destination market
- OE wheel part number or full OE wheel/tire dimensions
- Brake option and caliper template or scan
- Target front/rear sizes, ET and stance goal
- Suspension or body modifications
- Construction, spoke/concavity direction and finish
- Quantity per SKU, branding, packaging and document requirements
Compare other performance-platform projects in the forged wheel projects hub. The existing BMW fitment guide and Porsche fitment guide show why chassis and brake data must stay attached to each wheel SKU.
Frequently Asked Questions
Can I reuse an Audi RS fitment across different generations?
Do not assume so. PCD may be shared while offset, center bore, width, hardware, brake envelope and load requirements change.
Why can a wheel with the correct ET still hit the caliper?
ET positions the mounting face relative to the rim centerline; it does not define the spoke-back shape or inner-barrel profile.
Can an Audi RS use a deeper concave rear wheel?
It may be possible when rear width, offset, brake and body clearance allow it. The front and rear drawings must be reviewed separately.
Audi and Audi RS are trademarks of their respective owner. This independent sourcing guide does not imply affiliation or vehicle-manufacturer approval.
Send Your Audi RS Brake and Fitment Data
Provide model generation, year, axle, brake package, OE wheel/tire data, target size and ET, concavity direction, finish, quantity and destination. The quotation can then be tied to a controlled front/rear fitment.