275/60R20 vs 275/65R20
275/65R20 is outside the ±3% rule as a replacement for 275/60R20: the diameter differs by +3.28%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 275/65R20 on a car calibrated for 275/60R20, the speedometer reads 58.1 mph when you're really doing 60, and the odometer under-counts by 3.3%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.0 mph |
| 45 mph | 46.5 mph |
| 60 mph | 62.0 mph |
| 70 mph | 72.3 mph |
| 80 mph | 82.6 mph |
Other sizes close to 275/60R20
- 275/60R20 vs 275/55R20-3.28%
- 275/60R20 vs 265/60R20-1.43%
- 275/60R20 vs 305/55R20+0.66%
- 275/60R20 vs 285/55R20-1.97%
- 275/60R20 vs 285/60R20+1.43%
- 275/60R20 vs 33x12.50R20+0.02%
- 275/60R20 vs 295/60R20+2.86%
- 275/60R20 vs 295/55R20-0.66%
- 275/60R20 vs 285/65R20+4.83%
- 275/60R20 vs 245/60R20-4.30%
- 275/60R20 vs 305/50R20-2.98%
- 275/60R20 vs 255/60R20-2.86%
Questions
Can I replace 275/60R20 with 275/65R20?
275/65R20 is outside the ±3% rule as a replacement for 275/60R20: the diameter differs by +3.28%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 275/60R20 and 275/65R20?
275/65R20 is 1.08" taller and 0 mm wider; the sidewall is +0.54". At an indicated 60 mph you'd actually be doing 62.0 mph.
Will 275/65R20 fit on 275/60R20 wheels?
Both use a 20" rim, so the wheel diameter matches; check the wheel's width range for a 275 mm tire and the fender clearance.