285/65R17
285/65R17 ships as an OEM size on the Chevrolet Colorado. At 31.59″ diameter with a 7.29″ sidewall (65% of section width), this size turns 639 revolutions per mile.
About 285/65R17
Factory fitments for 285/65R17 include the Chevrolet Colorado — meaning replacement tires in this size see steady demand and broad brand availability. At 31.59″ overall diameter, 285/65R17 turns 639 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 275/65R17 drops diameter by 1.62%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 265/70R17 adds 0.06% 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 31.59″ 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 aliases285/65R17
- Diameter
- 31.59″ / 802.3mm
- Section Width
- 11.22″
- Sidewall
- 7.29″ / 185.25mm
- Circumference
- 99.23″
- Revs/Mile
- 639
265/65R17
- Diameter
- 30.56″ / 776.3mm
- Section Width
- 10.43″
- Sidewall
- 6.78″ / 172.25mm
- Circumference
- 96.02″
- Revs/Mile
- 660
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.06 mph (93.43 km/h). Your speedometer reads 3.24% high versus actual speed.