255/30R22 vs 265/30R22
265/30R22 is a safe swap for 255/30R22 by the usual ±3% rule: the diameter differs by +0.84%.
Speedometer and odometer
With 265/30R22 on a car calibrated for 255/30R22, the speedometer reads 59.5 mph when you're really doing 60, and the odometer under-counts by 0.8%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.3 mph |
| 45 mph | 45.4 mph |
| 60 mph | 60.5 mph |
| 70 mph | 70.6 mph |
| 80 mph | 80.7 mph |
Other sizes close to 255/30R22
Questions
Can I replace 255/30R22 with 265/30R22?
265/30R22 is a safe swap for 255/30R22 by the usual ±3% rule: the diameter differs by +0.84%.
What's the difference between 255/30R22 and 265/30R22?
265/30R22 is 0.24" taller and 10 mm wider; the sidewall is +0.12". At an indicated 60 mph you'd actually be doing 60.5 mph.
Will 265/30R22 fit on 255/30R22 wheels?
Both use a 22" rim, so the wheel diameter matches; check the wheel's width range for a 265 mm tire and the fender clearance.