The Toyota Supra brake rotor size depends on the generation, the model year and the brake package. Commonly cited figures for the 3.0-liter GR Supra are about 348 mm at the front and 345 mm at the rear, but other versions use different discs, so measure your rotor or confirm the part number before you buy. Related: Toyota Supra brake pad size chart.
Toyota Supra Brake Rotor Size by Model

Rotor sizes differ between generations and versions. For the GR Supra (A90), commonly cited figures for the 3.0 are about 348 mm front and 345 mm rear, while the 2.0 is lower-spec. For older Supras such as the Mk4, check the factory specification. Always confirm for your exact car.
Key Differences in Brake Rotor Sizes for GT and GTS Models
Trim names and brake packages differ by market and year. Compare the part numbers rather than the trim names.
Finding Trustworthy Sources for Supra Brake Parts

Buy from the dealer or from reputable parts retailers, and match the part number to your VIN.
Check Compatibility Before Buying Brake Rotors
Check the diameter, the thickness, the hat height and the bolt pattern, and confirm that the rotor suits your brake package.
Looking for Aftermarket Brake Rotors?
Aftermarket rotors range from plain replacements to slotted and drilled types. Choose a reputable brand, check the fitment and follow its guidance on pads.
Installing Brake Rotors: Tips and Tricks

Clean the hub face, torque the bolts to the specification, bed in the pads as instructed and use a shop if you are unsure. Support the car on jack stands.
Frequently Asked Questions
What Size Rotors Are on a Supra?
It depends on the generation and version. See the figures above and confirm for your car.
How Do I Know What Size Brake Rotors I Need?
Measure the diameter of the current rotor, or use the part number and the VIN.
What Size Brake Discs Are in the Supra A90?
Commonly cited figures for the 3.0 are about 348 mm front and 345 mm rear. Confirm for your version.
What Size Are S2000 Rotors?
That is a Honda question, since the S2000 is a different car. Check the Honda specification, because the parts are not interchangeable with the Supra.
Conclusion
For Toyota Supra brake rotor size, confirm the version and the part number before you buy.
