265/60R20 vs 305/55R20
305/55R20 is a safe swap for 265/60R20 by the usual ±3% rule: the diameter differs by +2.12%.
Speedometer and odometer
With 305/55R20 on a car calibrated for 265/60R20, the speedometer reads 58.8 mph when you're really doing 60, and the odometer under-counts by 2.1%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.6 mph |
| 45 mph | 46.0 mph |
| 60 mph | 61.3 mph |
| 70 mph | 71.5 mph |
| 80 mph | 81.7 mph |
Other sizes close to 265/60R20
- 265/60R20 vs 275/55R20-1.88%
- 265/60R20 vs 275/60R20+1.45%
- 265/60R20 vs 275/65R20+4.78%
- 265/60R20 vs 255/55R20-4.54%
- 265/60R20 vs 285/55R20-0.54%
- 265/60R20 vs 285/60R20+2.91%
- 265/60R20 vs 33x12.50R20+1.48%
- 265/60R20 vs 295/60R20+4.36%
- 265/60R20 vs 295/55R20+0.79%
- 265/60R20 vs 285/50R20-4.00%
- 265/60R20 vs 245/60R20-2.91%
- 265/60R20 vs 305/50R20-1.57%
Questions
Can I replace 265/60R20 with 305/55R20?
305/55R20 is a safe swap for 265/60R20 by the usual ±3% rule: the diameter differs by +2.12%.
What's the difference between 265/60R20 and 305/55R20?
305/55R20 is 0.69" taller and 40 mm wider; the sidewall is +0.34". At an indicated 60 mph you'd actually be doing 61.3 mph.
Will 305/55R20 fit on 265/60R20 wheels?
Both use a 20" rim, so the wheel diameter matches; check the wheel's width range for a 305 mm tire and the fender clearance.