255/75R17
255/75R17 ships as an OEM size on the Ford Bronco, Jeep Wrangler. At 32.06″ diameter with a 7.53″ sidewall (75% of section width), this size turns 629 revolutions per mile.
About 255/75R17
Factory fitments for 255/75R17 include the Ford Bronco, Jeep Wrangler — meaning replacement tires in this size see steady demand and broad brand availability. At 32.06″ overall diameter, 255/75R17 turns 629 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 75% aspect ratio gives it a tall, compliant sidewall that absorbs bumps well and protects rims off-road. The 17″ rim pairing is typical for light-truck, crossover, and mid-size SUV applications, so compatible wheels are easy to source new or used. Going one step shorter to 235/80R17 drops diameter by 0.80%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 275/70R17 adds 0.31% 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 32.06″ 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 aliases255/75R17
- Diameter
- 32.06″ / 814.3mm
- Section Width
- 10.04″
- Sidewall
- 7.53″ / 191.25mm
- Circumference
- 100.72″
- Revs/Mile
- 629
235/80R17
- Diameter
- 31.8″ / 807.8mm
- Section Width
- 9.25″
- Sidewall
- 7.4″ / 188mm
- Circumference
- 99.91″
- Revs/Mile
- 634
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 59.52 mph (95.79 km/h). Your speedometer reads 0.80% high versus actual speed.