245/70R16 vs 235/75R16
235/75R16 is a safe swap for 245/70R16 by the usual ±3% rule: the diameter differs by +1.27%.
Speedometer and odometer
With 235/75R16 on a car calibrated for 245/70R16, the speedometer reads 59.2 mph when you're really doing 60, and the odometer under-counts by 1.3%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.4 mph |
| 45 mph | 45.6 mph |
| 60 mph | 60.8 mph |
| 70 mph | 70.9 mph |
| 80 mph | 81.0 mph |
Other sizes close to 245/70R16
Questions
Can I replace 245/70R16 with 235/75R16?
235/75R16 is a safe swap for 245/70R16 by the usual ±3% rule: the diameter differs by +1.27%.
What's the difference between 245/70R16 and 235/75R16?
235/75R16 is 0.37" taller and 10 mm narrower; the sidewall is +0.19". At an indicated 60 mph you'd actually be doing 60.8 mph.
Will 235/75R16 fit on 245/70R16 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.