2021 Audi R8 Wheel Interchange

tl;dr

You are working with a 2021 Audi R8. Known OEM baseline here: 5x112 bolt pattern, M14 x 1.5 threads, 19x8.5 ET42 wheel, 245/35R19 tire. Center bore is not confirmed on this page. Use the calculator to compare donor wheels and tire sizes before buying. Keep tire diameter changes within about 2 to 3 percent. Watch inner clearance and outer poke when changing offset or width.

Known OEM fitment snapshot

Note: Some trims may run staggered setups or larger brakes. Verify your exact configuration by VIN or by reading the wheel and tire labels.

Recommendation

Start from the OEM 19x8.5 ET42 reference and model changes in the calculator. Keep overall tire diameter close to stock for speedometer and ABS stability. Limit offset change to small steps, then test for clearance at full lock and over bumps. If using aftermarket wheels with a larger center bore, plan for hub centric rings sized to your exact hub. Confirm the bolt seat type for your wheel and match your M14 x 1.5 hardware accordingly. Torque wheel bolts to the factory spec from your owner manual and recheck after 50 to 100 miles.

Impact

Offset and width

• Lower ET pushes the wheel outward. Inner clearance increases, poke increases.
• Higher ET pulls the wheel inward. Inner clearance decreases, fender poke decreases.
• Wider wheels add to both inner and outer edges. Check both sides in the calculator.

Tire size

• Taller tires raise ride height and soften gearing feel.
• Shorter tires lower the car and sharpen gearing feel.
• Stay near stock diameter for accurate speed readings and ESC behavior.

Hardware and vibration

• Correct center bore fit prevents vibration at highway speeds.
• Correct bolt seat prevents loosening and rotor hat damage.

Risks

• Unknown center bore causing vibration. Confirm and use proper rings if needed.
• Insufficient caliper or barrel clearance with certain spoke designs.
• Wrong bolt seat style for the wheel. Verify ball or cone seat before install.
• Excessive outer poke leading to fender contact on compression.
• Excessive inner pull causing strut, liner, or arm contact.
• Tire load index or speed rating below OEM. Do not downgrade.
• Spacer use without matching hubcentric design and correct bolt length.
• TPMS compatibility may vary by market. Confirm sensor type and frequency.

Next actions

Checklist

• Confirm your car’s exact trim, brakes, and whether it is staggered.
• Measure or confirm the hub center bore from OEM documentation.
• Verify wheel bolt seat style and required bolt length.
• Check tire load index and speed rating meet or exceed OEM.

Use the calculator

• Set Installed on to 2021 Audi R8 with the OEM values above.
• Enter Wheels from to model a donor set or Custom wheel size.
• Adjust rim width and ET in small steps. Watch inner clearance and poke values.
• Change tire section width and aspect ratio. Keep overall diameter within about 2 to 3 percent.
• Review backspacing and brake barrel clearance if changing diameter or width.

Fitment validation

• Dry fit the front first. Spin the wheel and check caliper to spoke clearance.
• Turn lock to lock while compressing the suspension slightly.
• Repeat for the rear. Load the car and recheck for rub on bumps.
• Install with clean hubs, correct hardware, and torque to factory spec.
• Re-torque after 50 to 100 miles and after any spacer use.

Gotchas

• Center bore is not listed here. Measure with a caliper or confirm by VIN.
• Backspacing changes quickly with width. Verify inner liner and arm clearance carefully.
• Aftermarket barrel shapes vary. A 19 inch wheel may still contact big calipers.

Tools that help

• Digital caliper for hub and ring sizing
• 1/2 inch torque wrench
• M14 x 1.5 wheel hanger guide pin
• Thin wall wheel socket set