2020 Audi TT Wheel Interchange

2020 Audi TT Wheel Interchange and Fitment Guide

If you are unsure what wheels will safely fit your 2020 Audi TT, you are not alone. The main problem is juggling bolt pattern, center bore, offset, brake clearance, and tire diameter under real-world constraints. This page shows the verified OEM baseline for your car, then walks you through using the on-page calculator to validate swaps and custom sizes with confidence.

1. Goal

Choose wheels and tires that bolt up correctly, clear brakes and suspension, sit flush within the fenders, and keep the overall tire diameter within a reasonable range for ABS and speedometer accuracy. You will validate every change using the calculator and a physical check before committing.

2. Prerequisites

• Know your exact vehicle: 2020 Audi TT. Brake package and trim can affect spoke and barrel clearance. If unsure, plan a test fit.
• OEM baseline for 2020 TT (do not assume this fits other years or trims):

• Seat type for wheel bolts depends on the wheel design. Many Audi OE wheels use a ball seat, while many aftermarket wheels use a cone seat. Match the seat type to the wheel. Do not mix seat types.
• Basic tools recommended for safe work and measurement:

• Torque wrench: Amazon search
• Wheel hanger/guide pin M14 x 1.5: Amazon search
• Digital caliper for center bore and spacer thickness: Amazon search
• Hub-centric rings to 57.1 mm if using larger-bore aftermarket wheels: Amazon search

3. Step by step

A. Set your baseline in the calculator

• Under Installed on (your vehicle), choose 2020 Audi TT.
• Confirm the baseline shows 18x8.5 ET50 with 245/40R18. These are the known OEM values listed above.

B. Compare a donor wheel

• Under Wheels from (donor vehicle), select the potential donor vehicle if known, or use Custom wheel size to enter the exact rim diameter, width, and offset printed on the candidate wheel.
• If you also plan to change tires, set Custom tire size. The calculator will update overall diameter for the comparison.

C. Check core fitment constraints

• Bolt pattern: Your TT is 5x112. The donor wheel must be 5x112. Adapters change this but add complexity and risk. Avoid unless you fully validate fastener length and hub support.
• Center bore: Your hub is 57.1 mm. Wheels with a larger center bore can be used with 57.1 mm hub-centric rings. Wheels with a smaller bore will not seat on the hub.
• Thread size and seat: M14x1.5 bolts required. Match bolt seat to the wheel seat design. Verify length if spacers are used.

D. Use the calculator’s clearance outputs

• Inner clearance: The tool shows how close the inner barrel moves relative to the strut and liners. A move inward reduces clearance and can create rub under load.
• Outer position (poke): The tool shows how far the wheel moves toward the fender. Too much poke risks fender contact on bumps or steering lock.
• Brake caliper clearance: Spoke shape is not reflected by offset alone. Use the calculator to shortlist options, then plan a physical test fit for spoke-to-caliper clearance.

E. Keep tire diameter changes reasonable

• To maintain speedometer and ABS behavior, it is recommended to keep overall tire diameter change modest. Use the calculator’s tire diameter and speedometer readout for validation.
• If you upsize the rim diameter, select a lower tire aspect ratio so the overall diameter stays close to stock.

F. Plan for spacers only when needed

• If inner clearance is too tight or spokes touch the caliper, a small spacer can help, but it reduces hub engagement and changes effective offset.
• Use hub-centric spacers with a center bore of 57.1 mm and ensure adequate thread engagement. A common guideline is thread engagement at least equal to the bolt diameter. Verify with a physical check.

4. Validation

• Hub fit: Confirm the wheel seats fully on the 57.1 mm hub. If the wheel bore is larger, install correct hub-centric rings and recheck.
• Fasteners: Confirm M14x1.5 bolts, correct seat type for the wheel, and proper thread engagement. If spacers are used, ensure longer bolts as required.
• Brake clearance: With the car on the ground, rotate each wheel by hand and listen for contact. Use a small piece of modeling clay on the caliper face to measure spoke clearance. Many installers target a small but safe air gap; increase clearance if the clay shows near contact.
• Fender and liner clearance: Turn steering from lock to lock and drive over a slow speed bump. Listen for rub on fender liners or arch trim. Recheck at full load if you often carry passengers or cargo.
• Road test: Verify straight-line stability, no vibration, and normal steering effort. If vibration occurs, recheck hub-centric rings and balance.
• Torque: Tighten to the torque spec in your Audi service information. Re-torque after 50–100 miles.

5. Troubleshooting

• Vibration at highway speed: Often caused by missing or incorrect hub-centric rings when using larger-bore wheels. Confirm 57.1 mm ring size. Rebalance the assembly if needed.
• Rubs at full lock: Offset likely moved the tire outward or inward too far. Use the calculator to reduce width or select an offset closer to ET50, or adjust tire section width/aspect ratio.
• Caliper contact or scraping: Spoke shape is the constraint. Add a minimal hub-centric spacer and recalc effective offset in the tool. Verify longer bolts and seat compatibility before driving.
• Wheels will not seat on hub: The wheel center bore is smaller than 57.1 mm. That wheel is incompatible without machining. Do not force fit.
• Bolts bottom out or do not tighten smoothly: Seat mismatch or incorrect bolt length. Confirm seat type and check that bolt shank length matches the wheel and any spacer thickness.
• Speedometer off or sluggish acceleration: Overall tire diameter increased too much. Use the calculator to bring the new tire diameter closer to stock.

6. Wrap up

Your 2020 Audi TT starts with a clear OEM baseline: 5x112, 57.1 mm center bore, M14x1.5 bolts, and an 18x8.5 ET50 wheel with 245/40R18 tires. From there, use the on-page calculator to model inner clearance, poke, and tire diameter changes before you buy. Validate hub fit, bolt seating, and brake clearance with a careful test fit. With those checks, you move from guesswork to a predictable, safe result.