285/75R16 vs 255/85R16
255/85R16 is a safe swap for 285/75R16 by the usual ±3% rule: the diameter differs by +0.72%.
Speedometer and odometer
With 255/85R16 on a car calibrated for 285/75R16, the speedometer reads 59.6 mph when you're really doing 60, and the odometer under-counts by 0.7%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.2 mph |
| 45 mph | 45.3 mph |
| 60 mph | 60.4 mph |
| 70 mph | 70.5 mph |
| 80 mph | 80.6 mph |
Other sizes close to 285/75R16
Questions
Can I replace 285/75R16 with 255/85R16?
255/85R16 is a safe swap for 285/75R16 by the usual ±3% rule: the diameter differs by +0.72%.
What's the difference between 285/75R16 and 255/85R16?
255/85R16 is 0.24" taller and 30 mm narrower; the sidewall is +0.12". At an indicated 60 mph you'd actually be doing 60.4 mph.
Will 255/85R16 fit on 285/75R16 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.