255/55R17
255/55R17 is uncommon as OEM fitment but appears as an aftermarket upsize option. At 28.04″ diameter with a 5.52″ sidewall (55% of section width), this size turns 719 revolutions per mile.
About 255/55R17
255/55R17 is less common as a factory fitment but is available as an aftermarket size, so SKU selection is narrower than mainstream OEM sizes. At 28.04″ overall diameter, 255/55R17 turns 719 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 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 245/55R17 drops diameter by 1.54%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 235/60R17 adds 0.21% 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 28.04″ 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 aliases255/55R17
- Diameter
- 28.04″ / 712.3mm
- Section Width
- 10.04″
- Sidewall
- 5.52″ / 140.25mm
- Circumference
- 88.1″
- Revs/Mile
- 719
235/55R17
- Diameter
- 27.18″ / 690.3mm
- Section Width
- 9.25″
- Sidewall
- 5.09″ / 129.25mm
- Circumference
- 85.38″
- Revs/Mile
- 742
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.15 mph (93.58 km/h). Your speedometer reads 3.09% high versus actual speed.