235/75R17 vs 275/70R17
275/70R17 is outside the ±3% rule as a replacement for 235/75R17: the diameter differs by +4.14%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 275/70R17 on a car calibrated for 235/75R17, the speedometer reads 57.6 mph when you're really doing 60, and the odometer under-counts by 4.1%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.2 mph |
| 45 mph | 46.9 mph |
| 60 mph | 62.5 mph |
| 70 mph | 72.9 mph |
| 80 mph | 83.3 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 245/75R17+1.91%
- 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 235/70R17-3.00%
Questions
Can I replace 235/75R17 with 275/70R17?
275/70R17 is outside the ±3% rule as a replacement for 235/75R17: the diameter differs by +4.14%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 235/75R17 and 275/70R17?
275/70R17 is 1.28" taller and 40 mm wider; the sidewall is +0.64". At an indicated 60 mph you'd actually be doing 62.5 mph.
Will 275/70R17 fit on 235/75R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 275 mm tire and the fender clearance.