245/70R16 vs 255/70R16
255/70R16 is a safe swap for 245/70R16 by the usual ±3% rule: the diameter differs by +1.87%.
Speedometer and odometer
With 255/70R16 on a car calibrated for 245/70R16, the speedometer reads 58.9 mph when you're really doing 60, and the odometer under-counts by 1.9%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.6 mph |
| 45 mph | 45.8 mph |
| 60 mph | 61.1 mph |
| 70 mph | 71.3 mph |
| 80 mph | 81.5 mph |
Other sizes close to 245/70R16
Questions
Can I replace 245/70R16 with 255/70R16?
255/70R16 is a safe swap for 245/70R16 by the usual ±3% rule: the diameter differs by +1.87%.
What's the difference between 245/70R16 and 255/70R16?
255/70R16 is 0.55" taller and 10 mm wider; the sidewall is +0.28". At an indicated 60 mph you'd actually be doing 61.1 mph.
Will 255/70R16 fit on 245/70R16 wheels?
Both use a 16" rim, so the wheel diameter matches; check the wheel's width range for a 255 mm tire and the fender clearance.