275/60R18
275/60R18 ships as an OEM size on the GMC Canyon. At 30.99″ diameter with a 6.50″ sidewall (60% of section width), this size turns 651 revolutions per mile.
About 275/60R18
Factory fitments for 275/60R18 include the GMC Canyon — meaning replacement tires in this size see steady demand and broad brand availability. At 30.99″ overall diameter, 275/60R18 turns 651 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 18″ rim pairing is typical for full-size truck, premium SUV, and sport-sedan platforms, so compatible wheels are easy to source new or used. Going one step shorter to 265/60R18 drops diameter by 1.52%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 255/65R18 adds 0.19% 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 30.99″ 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 aliases275/60R18
- Diameter
- 30.99″ / 787.2mm
- Section Width
- 10.83″
- Sidewall
- 6.5″ / 165mm
- Circumference
- 97.36″
- Revs/Mile
- 651
255/60R18
- Diameter
- 30.05″ / 763.2mm
- Section Width
- 10.04″
- Sidewall
- 6.02″ / 153mm
- Circumference
- 94.4″
- Revs/Mile
- 671
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.17 mph (93.62 km/h). Your speedometer reads 3.05% high versus actual speed.