265/70R16 vs 235/85R16
235/85R16 is outside the ±3% rule as a replacement for 265/70R16: the diameter differs by +3.67%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 235/85R16 on a car calibrated for 265/70R16, the speedometer reads 57.9 mph when you're really doing 60, and the odometer under-counts by 3.7%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.1 mph |
| 45 mph | 46.6 mph |
| 60 mph | 62.2 mph |
| 70 mph | 72.6 mph |
| 80 mph | 82.9 mph |
Other sizes close to 265/70R16
- 265/70R16 vs 265/75R16+3.41%
- 265/70R16 vs 245/70R17-0.33%
- 265/70R16 vs 245/75R16-0.45%
- 265/70R16 vs 225/75R16-4.31%
- 265/70R16 vs 265/65R17-0.14%
- 265/70R16 vs 245/70R16-3.60%
- 265/70R16 vs 215/85R16-0.71%
- 265/70R16 vs 255/70R16-1.80%
- 265/70R16 vs 235/75R17+0.89%
- 265/70R16 vs 235/75R16-2.38%
- 265/70R16 vs 275/70R16+1.80%
Questions
Can I replace 265/70R16 with 235/85R16?
235/85R16 is outside the ±3% rule as a replacement for 265/70R16: the diameter differs by +3.67%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 265/70R16 and 235/85R16?
235/85R16 is 1.12" taller and 30 mm narrower; the sidewall is +0.56". At an indicated 60 mph you'd actually be doing 62.2 mph.
Will 235/85R16 fit on 265/70R16 wheels?
Both use a 16" rim, so the wheel diameter matches; check the wheel's width range for a 235 mm tire and the fender clearance.