275/60R20 vs 285/60R20
285/60R20 is 0.47 inches taller than 275/60R20 and 10 mm (0.4 in) wider.
+1.4% height. Inside the usual 3% rule for a swap.
| Measurement | 275/60R20 | 285/60R20 | Difference |
|---|---|---|---|
| Overall height | 33.0 in | 33.5 in | +0.47 in (+1.4%) |
| Section width | 10.8 in | 11.2 in | +0.39 in (+10 mm) |
| Sidewall height | 6.5 in | 6.7 in | +0.24 in |
| Circumference | 103.6 in | 105.1 in | +1.5 in |
| Revolutions per mile | 611 | 603 | −9 |
| Ride height | +0.24 in |
Speedometer
With 285/60R20 fitted, a speedometer set up for 275/60R20 shows the first number when you are really doing the second.
- 3030.4 mph
- 4545.6 mph
- 6060.9 mph
- 7576.1 mph
The two sizes
275/60R20 is 33.0 inches tall with a 6.5-inch sidewall. 285/60R20 is 33.5 inches tall with a 6.7-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, 275/60R20 or 285/60R20?
285/60R20 is taller: 33.5 inches against 33.0. 285/60R20 is wider, at 285 mm.
Can I replace 275/60R20 with 285/60R20?
On height, yes: the difference is 1.4%, 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 285/60R20 on a vehicle set up for 275/60R20, the speedometer shows 60 mph at a true 60.9 mph, and 70 at 71.0.