315/70R17
315/70R17 ships as an OEM size on the Ford Bronco, Ford F-150. At 34.36″ diameter with a 8.68″ sidewall (70% of section width), this size turns 587 revolutions per mile.
About 315/70R17
Factory fitments for 315/70R17 include the Ford Bronco, Ford F-150 — meaning replacement tires in this size see steady demand and broad brand availability. At 34.36″ overall diameter, 315/70R17 turns 587 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 70% 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. If you are shopping for a direct replacement, any tire within roughly ±0.7″ of the 34.36″ 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 aliases315/70R17
- Diameter
- 34.36″ / 872.8mm
- Section Width
- 12.4″
- Sidewall
- 8.68″ / 220.5mm
- Circumference
- 107.95″
- Revs/Mile
- 587
265/70R17
- Diameter
- 31.61″ / 802.8mm
- Section Width
- 10.43″
- Sidewall
- 7.3″ / 185.5mm
- Circumference
- 99.29″
- Revs/Mile
- 638
Speedometer & Diameter Impact
Narrower tire — verify wheel widthAt an indicated 60 mph, your actual speed is 55.19 mph (88.82 km/h). Your speedometer reads 8.02% high versus actual speed.