275/65R20 vs 285/65R20
285/65R20 is 0.51 inches taller than 275/65R20 and 10 mm (0.4 in) wider.
+1.5% height. Inside the usual 3% rule for a swap.
| Measurement | 275/65R20 | 285/65R20 | Difference |
|---|---|---|---|
| Overall height | 34.1 in | 34.6 in | +0.51 in (+1.5%) |
| Section width | 10.8 in | 11.2 in | +0.39 in (+10 mm) |
| Sidewall height | 7.0 in | 7.3 in | +0.26 in |
| Circumference | 107.0 in | 108.7 in | +1.6 in |
| Revolutions per mile | 592 | 583 | −9 |
| Ride height | +0.26 in |
Speedometer
With 285/65R20 fitted, a speedometer set up for 275/65R20 shows the first number when you are really doing the second.
- 3030.5 mph
- 4545.7 mph
- 6060.9 mph
- 7576.1 mph
The two sizes
275/65R20 is 34.1 inches tall with a 7.0-inch sidewall. 285/65R20 is 34.6 inches tall with a 7.3-inch sidewall. A taller sidewall rides softer and gives more ground clearance; a shorter one turns in more sharply. Try other pairs in the tire size calculator.
More comparisons
Questions
Which is bigger, 275/65R20 or 285/65R20?
285/65R20 is taller: 34.6 inches against 34.1. 285/65R20 is wider, at 285 mm.
Can I replace 275/65R20 with 285/65R20?
On height, yes: the difference is 1.5%, inside the usual 3% rule. Check that the extra width clears the suspension and suits your rim width.
How much does the speedometer change?
With 285/65R20 on a vehicle set up for 275/65R20, the speedometer shows 60 mph at a true 60.9 mph, and 70 at 71.1.