285/65R20 vs 295/65R20
295/65R20 is a safe swap for 285/65R20 by the usual ±3% rule: the diameter differs by +1.48%.
Speedometer and odometer
With 295/65R20 on a car calibrated for 285/65R20, the speedometer reads 59.1 mph when you're really doing 60, and the odometer under-counts by 1.5%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.4 mph |
| 45 mph | 45.7 mph |
| 60 mph | 60.9 mph |
| 70 mph | 71.0 mph |
| 80 mph | 81.2 mph |
Other sizes close to 285/65R20
Questions
Can I replace 285/65R20 with 295/65R20?
295/65R20 is a safe swap for 285/65R20 by the usual ±3% rule: the diameter differs by +1.48%.
What's the difference between 285/65R20 and 295/65R20?
295/65R20 is 0.51" taller and 10 mm wider; the sidewall is +0.26". At an indicated 60 mph you'd actually be doing 60.9 mph.
Will 295/65R20 fit on 285/65R20 wheels?
Both use a 20" rim, so the wheel diameter matches; check the wheel's width range for a 295 mm tire and the fender clearance.