235/60R20
235/60R20 ships as an OEM size on the Cadillac XT6. At 31.10″ diameter with a 5.55″ sidewall (60% of section width), this size turns 648 revolutions per mile.
About 235/60R20
Factory fitments for 235/60R20 include the Cadillac XT6 — meaning replacement tires in this size see steady demand and broad brand availability. At 31.10″ overall diameter, 235/60R20 turns 648 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 60% aspect ratio gives it a balanced sidewall — enough compliance for daily comfort without vague steering. The 20″ rim pairing is typical for luxury SUV and performance-oriented platforms, so compatible wheels are easy to source new or used. Going one step shorter to 255/55R20 drops diameter by 0.19%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 245/60R20 adds 1.52% diameter — also inside the safe window, with marginally taller ride height. If you are shopping for a direct replacement, any tire within roughly ±0.7″ of the 31.10″ stock diameter (about ±2% in percentage terms) will keep ABS, TPMS, and odometer readings inside the vehicle's designed tolerance.
Compare with another size
275/65R18 or "33" for inch aliases235/60R20
- Diameter
- 31.1″ / 790mm
- Section Width
- 9.25″
- Sidewall
- 5.55″ / 141mm
- Circumference
- 97.71″
- Revs/Mile
- 648
235/55R20
- Diameter
- 30.18″ / 766.5mm
- Section Width
- 9.25″
- Sidewall
- 5.09″ / 129.25mm
- Circumference
- 94.8″
- Revs/Mile
- 668
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.22 mph (93.69 km/h). Your speedometer reads 2.97% high versus actual speed.