255/55R19

About 255/55R19

Factory fitments for 255/55R19 include the Audi Q7, Mercedes-Benz GLE, Porsche Cayenne — meaning replacement tires in this size see steady demand and broad brand availability. At 30.04″ overall diameter, 255/55R19 turns 671 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 19″ 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 245/55R19 drops diameter by 1.44%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 235/60R19 adds 0.20% 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 30.04″ stock diameter (about ±2% in percentage terms) will keep ABS, TPMS, and odometer readings inside the vehicle's designed tolerance.

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