245/40R19

About 245/40R19

Factory fitments for 245/40R19 include the BMW 5 Series, Cadillac CT5 — meaning replacement tires in this size see steady demand and broad brand availability. At 26.72″ overall diameter, 245/40R19 turns 755 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 40% aspect ratio gives it a low-profile sidewall that delivers sharp steering response but transmits road imperfections. 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 235/40R19 drops diameter by 1.18%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 225/45R19 adds 0.96% 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 26.72″ stock diameter (about ±2% in percentage terms) will keep ABS, TPMS, and odometer readings inside the vehicle's designed tolerance.

Compare with another size