265/65R18

About 265/65R18

Factory fitments for 265/65R18 include the Chevrolet Colorado, Chevrolet Silverado 1500 — meaning replacement tires in this size see steady demand and broad brand availability. At 31.56″ overall diameter, 265/65R18 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 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 255/65R18 drops diameter by 1.62%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 255/70R18 adds 1.56% 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 31.56″ stock diameter (about ±2% in percentage terms) will keep ABS, TPMS, and odometer readings inside the vehicle's designed tolerance.

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