285/70R17 vs 285/75R17
285/75R17 is 1.12 inches taller than 285/70R17 and the same width.
+3.4% height. Outside the usual 3% rule: the speedometer and ride height change noticeably.
| Measurement | 285/70R17 | 285/75R17 | Difference |
|---|---|---|---|
| Overall height | 32.7 in | 33.8 in | +1.12 in (+3.4%) |
| Section width | 11.2 in | 11.2 in | ±0.00 in (±0 mm) |
| Sidewall height | 7.9 in | 8.4 in | +0.56 in |
| Circumference | 102.8 in | 106.3 in | +3.5 in |
| Revolutions per mile | 617 | 596 | −20 |
| Ride height | +0.56 in |
Speedometer
With 285/75R17 fitted, a speedometer set up for 285/70R17 shows the first number when you are really doing the second.
- 3031.0 mph
- 4546.5 mph
- 6062.1 mph
- 7577.6 mph
The two sizes
285/70R17 is 32.7 inches tall with a 7.9-inch sidewall. 285/75R17 is 33.8 inches tall with a 8.4-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, 285/70R17 or 285/75R17?
285/75R17 is taller: 33.8 inches against 32.7. They are the same width.
Can I replace 285/70R17 with 285/75R17?
It is 3.4% taller, outside the usual 3% rule, so expect a noticeable speedometer change and check for rubbing at full lock and full suspension travel.
How much does the speedometer change?
With 285/75R17 on a vehicle set up for 285/70R17, the speedometer shows 60 mph at a true 62.1 mph, and 70 at 72.4.