255/50R19
255/50R19 is uncommon as OEM fitment but appears as an aftermarket upsize option. At 29.04″ diameter with a 5.02″ sidewall (50% of section width), this size turns 695 revolutions per mile.
About 255/50R19
255/50R19 is less common as a factory fitment but is available as an aftermarket size, so SKU selection is narrower than mainstream OEM sizes. At 29.04″ overall diameter, 255/50R19 turns 695 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 50% 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 245/50R19 drops diameter by 1.36%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 235/55R19 adds 0.47% 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 29.04″ stock diameter (about ±2% in percentage terms) will keep ABS, TPMS, and odometer readings inside the vehicle's designed tolerance.
Compare with another size
275/65R18 or "33" for inch aliases255/50R19
- Diameter
- 29.04″ / 737.6mm
- Section Width
- 10.04″
- Sidewall
- 5.02″ / 127.5mm
- Circumference
- 91.23″
- Revs/Mile
- 695
235/50R19
- Diameter
- 28.25″ / 717.6mm
- Section Width
- 9.25″
- Sidewall
- 4.63″ / 117.5mm
- Circumference
- 88.76″
- Revs/Mile
- 714
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.37 mph (93.94 km/h). Your speedometer reads 2.71% high versus actual speed.