225/60R18
225/60R18 ships as an OEM size on the BMW X3, Chevrolet Equinox. At 28.63″ diameter with a 5.31″ sidewall (60% of section width), this size turns 704 revolutions per mile.
About 225/60R18
Factory fitments for 225/60R18 include the BMW X3, Chevrolet Equinox — meaning replacement tires in this size see steady demand and broad brand availability. At 28.63″ overall diameter, 225/60R18 turns 704 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 235/55R18 drops diameter by 1.58%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 235/60R18 adds 1.65% 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 28.63″ 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 aliases225/60R18
- Diameter
- 28.63″ / 727.2mm
- Section Width
- 8.86″
- Sidewall
- 5.31″ / 135mm
- Circumference
- 89.94″
- Revs/Mile
- 704
215/55R18
- Diameter
- 27.31″ / 693.7mm
- Section Width
- 8.46″
- Sidewall
- 4.66″ / 118.25mm
- Circumference
- 85.8″
- Revs/Mile
- 738
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 57.24 mph (92.11 km/h). Your speedometer reads 4.61% high versus actual speed.