275/55R20 vs 275/60R20 at a glance
| Measure | 275/55R20 (current) | 275/60R20 (new) | Difference |
|---|---|---|---|
| Overall height | 31.91 in | 32.99 in | +1.08 in (+3.39%) |
| Width | 10.83 in (275 mm) | 10.83 in (275 mm) | +0 mm |
| Sidewall | 5.95 in | 6.50 in | +0.54 in |
| Wheel | 20 in | 20 in | +0 in |
| Circumference | 100.2 in | 103.6 in | +3.4 in |
| Revs per mile | 632.0 | 611.3 | −20.7 |
Verdict: check clearance and speedometer
Over 3% and up to 5%: worth checking clearance, the speedometer and gearing before you buy. Going from 275/55R20 to 275/60R20 is a 3.4% increase in overall height (+1.08 in), and the vehicle sits about 0.54 in higher. The tire is the same width. The 3% rule of thumb comes from Discount Tire and 1010tires; it is not a guarantee of fit.
True speed and odometer
| Speedometer shows | You are really doing | Difference |
|---|---|---|
| 35 mph | 36.2 mph | +1.2 mph |
| 45 mph | 46.5 mph | +1.5 mph |
| 55 mph | 56.9 mph | +1.9 mph |
| 60 mph | 62.0 mph | +2.0 mph |
| 65 mph | 67.2 mph | +2.2 mph |
| 70 mph | 72.4 mph | +2.4 mph |
| 75 mph | 77.5 mph | +2.5 mph |
Odometer: 1,000 indicated miles is 1,034 real miles, and 10,000 is 10,339.
The math
275/55R20: 20 + 2 × (275 × 55% ÷ 25.4) = 31.91 in. 275/60R20: 20 + 2 × (275 × 60% ÷ 25.4) = 32.99 in. Change = 32.99 ÷ 31.91 − 1 = +3.39%. True speed at 60 = 60 × 32.99 ÷ 31.91 = 62.04 mph.
Check next
- Regear and RPM at cruise for this swap
- Speedometer and odometer correction
- Other sizes within ±3% of 275/55R20
Calculated from the size alone. Real tires vary a little by brand and model, and the loaded radius is a bit smaller. Confirm the wheel width range, clearance, load index and speed rating for your vehicle. See how to read a tire size, the load index chart and the speed rating chart.
Size pages: 275/55R20 · 275/60R20. More swaps: all tire size comparisons.