295/55R18
295/55R18 is uncommon as OEM fitment but appears as an aftermarket upsize option. At 30.78″ diameter with a 6.39″ sidewall (55% of section width), this size turns 655 revolutions per mile.
About 295/55R18
295/55R18 is less common as a factory fitment but is available as an aftermarket size, so SKU selection is narrower than mainstream OEM sizes. At 30.78″ overall diameter, 295/55R18 turns 655 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 18″ 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 285/55R18 drops diameter by 1.41%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 275/60R18 adds 0.70% 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 30.78″ 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 aliases295/55R18
- Diameter
- 30.78″ / 781.7mm
- Section Width
- 11.61″
- Sidewall
- 6.39″ / 162.25mm
- Circumference
- 96.68″
- Revs/Mile
- 655
275/55R18
- Diameter
- 29.91″ / 759.7mm
- Section Width
- 10.83″
- Sidewall
- 5.95″ / 151.25mm
- Circumference
- 93.96″
- Revs/Mile
- 674
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.31 mph (93.84 km/h). Your speedometer reads 2.81% high versus actual speed.