275/55R20 vs 275/60R20
275/60R20 is 1.1 inches taller and 0.0 inches wider. When your speedometer says 60 mph, you'd really be doing 62.0.
I have 275/55R20
I'm looking at 275/60R20
Possible, with caveats
1.1 in taller. At 60 mph on the speedometer you'd really be doing 62.0.
- More than 3% taller. Expect a noticeable speedometer error, and check that it clears the fenders and suspension when turning. Trucks often need a leveling kit.
275/55R20 now 275/60R20 newTo scale
At an indicated 60 mph you're really doing 62.0 mph
+1.08″
Height
+0.00″
Width
+0.54″
Sidewall
All measurements
| 275/55R20 | 275/60R20 | Change | |
|---|---|---|---|
| Overall height | 31.91″ | 32.99″ | +1.08″ |
| Section width | 10.83″ | 10.83″ | +0.00″ |
| Sidewall height | 5.95″ | 6.50″ | +0.54″ |
| Wheel size | 20″ | 20″ | same |
| Distance per turn | 100.25″ | 103.65″ | +3.40″ |
| Turns per mile | 632 | 611 | −21 |
Speedometer after switching
Your speedometer is calibrated for 275/55R20. On 275/60R20:
| Speedometer says | You're really doing |
|---|---|
| 25 mph | 25.8 mph |
| 35 mph | 36.2 mph |
| 45 mph | 46.5 mph |
| 55 mph | 56.9 mph |
| 65 mph | 67.2 mph |
| 75 mph | 77.5 mph |
What changes on the vehicle
- Ride height goes up about 0.54″ (half the height difference).
- The tire turns 21 fewer times per mile, so your odometer will read low by about 3.4%.
- The sidewall is 0.54″ taller, on the same wheels.