265/65R17 vs 235/80R17
235/80R17 is outside the ±3% rule as a replacement for 265/65R17: the diameter differs by +4.06%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 235/80R17 on a car calibrated for 265/65R17, the speedometer reads 57.7 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 | 46.8 mph |
| 60 mph | 62.4 mph |
| 70 mph | 72.8 mph |
| 80 mph | 83.2 mph |
Other sizes close to 265/65R17
- 265/65R17 vs 265/70R17+3.41%
- 265/65R17 vs 265/60R18-0.14%
- 265/65R17 vs 245/70R17-0.19%
- 265/65R17 vs 245/65R17-3.35%
- 265/65R17 vs 245/75R16-0.31%
- 265/65R17 vs 245/75R17+2.96%
- 265/65R17 vs 265/70R16+0.14%
- 265/65R17 vs 255/65R17-1.67%
- 265/65R17 vs 215/85R16-0.57%
- 265/65R17 vs 255/70R17+1.61%
- 265/65R17 vs 255/75R17+4.90%
- 265/65R17 vs 235/75R17+1.03%
Questions
Can I replace 265/65R17 with 235/80R17?
235/80R17 is outside the ±3% rule as a replacement for 265/65R17: the diameter differs by +4.06%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 265/65R17 and 235/80R17?
235/80R17 is 1.24" taller and 30 mm narrower; the sidewall is +0.62". At an indicated 60 mph you'd actually be doing 62.4 mph.
Will 235/80R17 fit on 265/65R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 235 mm tire and the fender clearance.