275/65R20 vs 35x12.50R20
35x12.50R20 is a safe swap for 275/65R20 by the usual ±3% rule: the diameter differs by +2.72%.
Side by side
| 275/65R20 | 35x12.50R20 | Difference | |
|---|---|---|---|
| Overall diameter | 34.07" | 35.00" | +0.93" (+2.72%) |
| Section width | 275 mm | 318 mm | +43 mm |
| Sidewall | 7.04" | 7.50" | +0.46" |
| Rim | 20" | 20" | same |
| Circumference | 107.0" | 110.0" | +2.9" |
| Revs per mile | 592 | 576 | -16 |
| Ride height | — | — | +0.46" |
| Speedometer reads 60 mph | 60.0 | 61.6 | +1.6 mph |
Speedometer and odometer
With 35x12.50R20 on a car calibrated for 275/65R20, the speedometer reads 58.4 mph when you're really doing 60, and the odometer under-counts by 2.7%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.8 mph |
| 45 mph | 46.2 mph |
| 60 mph | 61.6 mph |
| 70 mph | 71.9 mph |
| 80 mph | 82.2 mph |
Other sizes close to 275/65R20
- 275/65R20 vs 275/60R20-3.18%
- 275/65R20 vs 265/60R20-4.56%
- 275/65R20 vs 305/55R20-2.54%
- 275/65R20 vs 285/60R20-1.79%
- 275/65R20 vs 33x12.50R20-3.15%
- 275/65R20 vs 295/60R20-0.40%
- 275/65R20 vs 295/55R20-3.81%
- 275/65R20 vs 295/65R20+3.00%
- 275/65R20 vs 285/65R20+1.50%
- 275/65R20 vs 325/60R20+3.76%
- 275/65R20 vs 35x11.50R20+2.72%
- 275/65R20 vs 35x13.50R20+2.72%
Questions
Can I replace 275/65R20 with 35x12.50R20?
35x12.50R20 is a safe swap for 275/65R20 by the usual ±3% rule: the diameter differs by +2.72%.
What's the difference between 275/65R20 and 35x12.50R20?
35x12.50R20 is 0.93" taller and 43 mm wider; the sidewall is +0.46". At an indicated 60 mph you'd actually be doing 61.6 mph.
Will 35x12.50R20 fit on 275/65R20 wheels?
Both use a 20" rim, so the wheel diameter matches; check the wheel's width range for a 318 mm tire and the fender clearance.