255/70R17

About 255/70R17

Factory fitments for 255/70R17 include the Chevrolet Silverado 1500, Ford Bronco, GMC Sierra 1500 — meaning replacement tires in this size see steady demand and broad brand availability. At 31.06″ overall diameter, 255/70R17 turns 649 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 70% aspect ratio gives it a tall, compliant sidewall that absorbs bumps well and protects rims off-road. The 17″ rim pairing is typical for light-truck, crossover, and mid-size SUV applications, so compatible wheels are easy to source new or used. Going one step shorter to 245/70R17 drops diameter by 1.77%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 245/75R17 adds 1.33% 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 31.06″ stock diameter (about ±2% in percentage terms) will keep ABS, TPMS, and odometer readings inside the vehicle's designed tolerance.

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