285/60R18
285/60R18 ships as an OEM size on the Toyota Land Cruiser. At 31.46″ diameter with a 6.73″ sidewall (60% of section width), this size turns 641 revolutions per mile.
About 285/60R18
Factory fitments for 285/60R18 include the Toyota Land Cruiser — meaning replacement tires in this size see steady demand and broad brand availability. At 31.46″ overall diameter, 285/60R18 turns 641 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 275/60R18 drops diameter by 1.50%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 265/65R18 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 31.46″ 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 aliases285/60R18
- Diameter
- 31.46″ / 799.2mm
- Section Width
- 11.22″
- Sidewall
- 6.73″ / 171mm
- Circumference
- 98.85″
- Revs/Mile
- 641
265/60R18
- Diameter
- 30.52″ / 775.2mm
- Section Width
- 10.43″
- Sidewall
- 6.26″ / 159mm
- Circumference
- 95.88″
- Revs/Mile
- 661
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.2 mph (93.66 km/h). Your speedometer reads 3.00% high versus actual speed.