235/80R17
235/80R17 is uncommon as OEM fitment but appears as an aftermarket upsize option. At 31.80″ diameter with a 7.40″ sidewall (80% of section width), this size turns 634 revolutions per mile.
About 235/80R17
235/80R17 is less common as a factory fitment but is available as an aftermarket size, so SKU selection is narrower than mainstream OEM sizes. At 31.80″ overall diameter, 235/80R17 turns 634 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 80% aspect ratio gives it a tall, compliant sidewall that absorbs bumps well and protects rims off-road. 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 245/75R17 drops diameter by 1.05%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 255/75R17 adds 0.80% 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 31.80″ 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 aliases235/80R17
- Diameter
- 31.8″ / 807.8mm
- Section Width
- 9.25″
- Sidewall
- 7.4″ / 188mm
- Circumference
- 99.91″
- Revs/Mile
- 634
245/70R17
- Diameter
- 30.5″ / 774.8mm
- Section Width
- 9.65″
- Sidewall
- 6.75″ / 171.5mm
- Circumference
- 95.83″
- Revs/Mile
- 661
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 57.55 mph (92.62 km/h). Your speedometer reads 4.09% high versus actual speed.