2018 Audi R8 Wheel Interchange

tl;dr

The 2018 Audi R8 uses a 5x112 bolt pattern, 57.1 mm center bore, and M14 x 1.5 threads. A documented factory baseline is 19x8.5 ET42 with 245/35R19. Use this as your reference in the calculator to evaluate donor wheels. Keep the wheel hubcentric, offset changes small, and verify brake and fender clearance before buying.

Recommendation

I treat every R8 fitment as brake-first. The calipers are large. Start from the known OEM spec below, then model changes in the on-page calculator.

• Set Installed on your vehicle to 2018 Audi R8.
• Confirm the baseline matches your car. If your car shows different sizes front or rear, use those. The R8 may be staggered. Trim and package can vary. Verify with your door label, owner manual, or VIN data.
• Set Wheels from donor vehicle to the wheel you want to try. Or use Custom wheel size and Custom tire size.
• Aim to keep tire diameter change small. I target within about 2 percent.
• Watch poke and inner clearance readouts. A few millimeters matter on an R8. Favor inner clearance for brake and strut safety.
• Keep the hub bore 57.1 mm. If the wheel bore is larger, use 57.1 hub-centric rings. Never force a smaller bore.
• Match the M14 x 1.5 thread. Seat type can vary by wheel. Confirm the correct seat with your wheel supplier or OEM guide.

Known OEM baseline for 2018 Audi R8

The values below reflect a documented factory configuration. Other factory setups may differ by trim or axle. Do not assume both axles match. Confirm on your vehicle and in the calculator.

Impact

Here is how changes affect your R8 in practice.

• Offset: Lower ET pushes the wheel outward. More poke. Higher ET pulls inward. More strut and brake proximity.
• Width: Wider wheels change both inner and outer clearance. The calculator splits the change evenly from centerline by default.
• Tire diameter: Larger diameter fills the arch and can rub at compression. Smaller diameter increases fender gap and raises revs at speed.
• Steering feel: More scrub radius from outward poke can add kickback and tramlining.
• Brake clearance: The R8 calipers need room at the barrel and spokes. Model inner clearance, then test-fit before mounting tires.
• Speedometer: Diameter changes alter indicated speed. Keep the change modest for accuracy.

Risks

• Brake barrel rub. Common with tight-offset concave wheels on R8s.
• Inner liner or upright contact at full lock or compression.
• Incorrect lug seat type. This can loosen hardware. Confirm ball vs cone with the wheel supplier.
• Non-hubcentric fit. Vibrations at highway speed. Use 57.1 mm rings when needed.
• Load rating mismatch. Wheel and tire must meet or exceed axle loads.
• TPMS compatibility may vary by wheel and sensor. Verify with OEM guidance.

Next actions

Checklist

• Identify your exact factory sizes front and rear. Use the door label and owner manual. If unsure, input your current sizes into the calculator and match visual clearance.
• In the calculator, set your car as Installed on. Enter your actual tire size per axle.
• Enter donor wheel specs. Use Custom wheel size and Custom tire size to fine tune width, offset, and aspect ratio. Note that changing rim diameter updates tire diameter in the comparison.
• Target small changes in poke and inner clearance. Keep diameter change conservative.
• Confirm hub bore 57.1 mm. Add rings if the wheel bore is larger.
• Match M14 x 1.5 hardware and correct seat type. Do not mix seats.
• Test-fit a bare wheel on the car. Spin it. Check caliper and suspension clearance with a feeler and light.
• Torque to the OEM spec from your manual. Re-torque after 50 to 100 miles.

Useful tools

• 1/2 inch torque wrench
• Wheel hanger guide pin M14x1.5
• 57.1 hub-centric rings
• 6 inch digital caliper

Gotchas

• Some R8s have different front and rear specs. Model each axle.
• Carbon ceramic packages need extra barrel clearance. Verify by test fit.
• Do not rely on generic lug bolts. Seat profile must match the wheel.
• Do not downsize center bore. It will not fit the hub.

If anything differs from the values shown, do not guess. Confirm with the calculator on wheelinterchange.com and your OEM sources before purchasing.