235/75R17 vs 245/75R17
245/75R17 is a safe swap for 235/75R17 by the usual ±3% rule: the diameter differs by +1.91%.
Speedometer and odometer
With 245/75R17 on a car calibrated for 235/75R17, the speedometer reads 58.9 mph when you're really doing 60, and the odometer under-counts by 1.9%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.6 mph |
| 45 mph | 45.9 mph |
| 60 mph | 61.1 mph |
| 70 mph | 71.3 mph |
| 80 mph | 81.5 mph |
Other sizes close to 235/75R17
- 235/75R17 vs 265/70R17+2.36%
- 235/75R17 vs 245/70R17-1.21%
- 235/75R17 vs 245/65R17-4.34%
- 235/75R17 vs 265/65R17-1.02%
- 235/75R17 vs 265/70R16-0.88%
- 235/75R17 vs 235/80R17+3.00%
- 235/75R17 vs 255/65R18+0.56%
- 235/75R17 vs 255/65R17-2.68%
- 235/75R17 vs 255/70R17+0.57%
- 235/75R17 vs 255/75R17+3.83%
- 235/75R17 vs 275/70R17+4.14%
- 235/75R17 vs 235/70R17-3.00%
Questions
Can I replace 235/75R17 with 245/75R17?
245/75R17 is a safe swap for 235/75R17 by the usual ±3% rule: the diameter differs by +1.91%.
What's the difference between 235/75R17 and 245/75R17?
245/75R17 is 0.59" taller and 10 mm wider; the sidewall is +0.30". At an indicated 60 mph you'd actually be doing 61.1 mph.
Will 245/75R17 fit on 235/75R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 245 mm tire and the fender clearance.