255/35R20
255/35R20 ships as an OEM size on the Acura TLX. At 27.03″ diameter with a 3.51″ sidewall (35% of section width), this size turns 746 revolutions per mile.
About 255/35R20
Factory fitments for 255/35R20 include the Acura TLX — meaning replacement tires in this size see steady demand and broad brand availability. At 27.03″ overall diameter, 255/35R20 turns 746 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 35% aspect ratio gives it an ultra-low-profile sidewall tuned for maximum steering precision — at the cost of ride comfort and rim protection. 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 245/35R20 drops diameter by 1.02%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 235/40R20 adds 1.38% 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 27.03″ 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 aliases255/35R20
- Diameter
- 27.03″ / 686.5mm
- Section Width
- 10.04″
- Sidewall
- 3.51″ / 89.25mm
- Circumference
- 84.91″
- Revs/Mile
- 746
235/35R20
- Diameter
- 26.48″ / 672.5mm
- Section Width
- 9.25″
- Sidewall
- 3.24″ / 82.25mm
- Circumference
- 83.18″
- Revs/Mile
- 762
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.78 mph (94.59 km/h). Your speedometer reads 2.04% high versus actual speed.