245/75R16 vs 235/85R16
235/85R16 is outside the ±3% rule as a replacement for 245/75R16: the diameter differs by +4.13%, 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 245/75R16, 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 245/75R16
- 245/75R16 vs 265/75R16+3.88%
- 245/75R16 vs 245/70R17+0.12%
- 245/75R16 vs 225/75R16-3.88%
- 245/75R16 vs 265/65R17+0.31%
- 245/75R16 vs 265/70R16+0.45%
- 245/75R16 vs 235/70R16-4.97%
- 245/75R16 vs 245/70R16-3.17%
- 245/75R16 vs 215/85R16-0.26%
- 245/75R16 vs 255/70R16-1.36%
- 245/75R16 vs 235/75R16-1.94%
- 245/75R16 vs 255/65R16-4.65%
- 245/75R16 vs 275/70R16+2.26%
Questions
Can I replace 245/75R16 with 235/85R16?
235/85R16 is outside the ±3% rule as a replacement for 245/75R16: the diameter differs by +4.13%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 245/75R16 and 235/85R16?
235/85R16 is 1.26" taller and 10 mm narrower; the sidewall is +0.63". At an indicated 60 mph you'd actually be doing 62.5 mph.
Will 235/85R16 fit on 245/75R16 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.