255/65R17
255/65R17 ships as an OEM size on the Chevrolet Colorado, Ford Ranger, GMC Canyon. At 30.05″ diameter with a 6.53″ sidewall (65% of section width), this size turns 671 revolutions per mile.
About 255/65R17
Factory fitments for 255/65R17 include the Chevrolet Colorado, Ford Ranger, GMC Canyon — meaning replacement tires in this size see steady demand and broad brand availability. At 30.05″ overall diameter, 255/65R17 turns 671 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 65% aspect ratio gives it a balanced sidewall — enough compliance for daily comfort without vague steering. 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 235/70R17 drops diameter by 0.33%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 245/70R17 adds 1.51% 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 30.05″ 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 aliases255/65R17
- Diameter
- 30.05″ / 763.3mm
- Section Width
- 10.04″
- Sidewall
- 6.53″ / 165.75mm
- Circumference
- 94.41″
- Revs/Mile
- 671
235/65R17
- Diameter
- 29.03″ / 737.3mm
- Section Width
- 9.25″
- Sidewall
- 6.01″ / 152.75mm
- Circumference
- 91.19″
- Revs/Mile
- 695
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 57.96 mph (93.27 km/h). Your speedometer reads 3.41% high versus actual speed.