Toyota Supra center bore is the hole in the middle of the wheel that fits over the hub. Wheels for the GR Supra (A90/A91) are commonly listed with a 66.5 mm bore, but confirm the figure with your wheel maker and measure your own hub, because older generations use different sizes. If a wheel’s bore is larger than the hub, hub-centric rings fill the gap.
Essential Tips for Choosing Aftermarket Wheels for Your Toyota Supra
- Confirm the bolt pattern and the center bore for your generation.
- Match or closely follow the factory width and offset.
- Use hub-centric rings if the wheel bore is larger than the hub.
- Buy from a maker that lists fitment for your car.
Toyota Supra Center Bore Explained
The center bore is the hole in the middle of the wheel, measured in millimetres. On a hub-centric fit, the hub carries the wheel’s weight and the lug nuts only clamp it in place.
Importance of Center Bore
A wheel whose bore is smaller than the hub will not fit at all. A wheel whose bore is larger can fit, but it needs hub-centric rings to center it and avoid vibration.
Measuring Center Bore Accurately
- Remove the wheel and place it face down.
- Use calipers to measure across the center hole.
- Measure the hub diameter on the car as well.
- Compare the two numbers with the wheel maker’s listing.
Center Bore Specifications for Each Supra Generation
Center bores differ between generations, so confirm the figure for the exact car with the wheel maker or a hub measurement.
Center Bore for Supra V
The GR Supra (A90/A91) is commonly listed with a 66.5 mm bore. Confirm the number with the wheel maker before you buy.
Center Bore for Supra IV
The MK4 Supra has a different bolt pattern and a different hub, so wheels are not interchangeable with the GR Supra. Measure your hub or check the wheel maker’s listing.
Why Hubcentric Rings Matter for Wheel Fitment
Hub-centric rings fill the gap between a larger wheel bore and the hub. They help the wheel run true and reduce vibration at speed.
How to Measure the Center Bore of Your Toyota Supra
- Take the wheel off the car.
- Measure across the center hole with calipers.
- Measure the hub on the car.
- Record both measurements in millimetres.
Common Issues Related to Incorrect Center Bore
- Vibration at highway speed.
- A wheel that will not sit flush on the hub.
- Uneven pressure on the studs or bolts.
Resources for Center Bore and Wheel Fitment Assistance
Wheel makers usually publish fitment lists, and Supra owner forums and specialist tire shops can help confirm fitment for your car.
Frequently Asked Questions
What Is the Center Bore of the a90 Supra?
It is commonly listed as 66.5 mm. Confirm it with the wheel maker or measure your own hub.
How to Measure Wheel Center Bore Size?
Remove the wheel and measure across the center hole with calipers, in millimetres.
What Is the Center Bore of the Supra mk4?
It is different from the GR Supra. Check the specification for your model year or measure your hub.
What Is My Centre Bore Size?
The only sure way is to measure your wheel or hub. The listing or manual for your wheel may also give it.
Conclusion
Confirm the center bore for your generation, use hub-centric rings if the wheel bore is larger and always check fitment with the maker.
