255/55R20

About 255/55R20

Factory fitments for 255/55R20 include the Buick Enclave, Chevrolet Traverse, Ford Explorer — meaning replacement tires in this size see steady demand and broad brand availability. At 31.04″ overall diameter, 255/55R20 turns 650 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 55% aspect ratio gives it a moderate sidewall suited to sporty street driving and responsive turn-in. The 20″ rim pairing is typical for luxury SUV and performance-oriented platforms, so compatible wheels are easy to source new or used. Going one step shorter to 245/55R20 drops diameter by 1.40%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 235/60R20 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 31.04″ stock diameter (about ±2% in percentage terms) will keep ABS, TPMS, and odometer readings inside the vehicle's designed tolerance.

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