285/75R16 vs 305/70R16
305/70R16 is 0.02 inches shorter than 285/75R16 and 20 mm (0.8 in) wider.
−0.1% height. Inside the usual 3% rule for a swap.
| Measurement | 285/75R16 | 305/70R16 | Difference |
|---|---|---|---|
| Overall height | 32.8 in | 32.8 in | −0.02 in (−0.1%) |
| Section width | 11.2 in | 12.0 in | +0.79 in (+20 mm) |
| Sidewall height | 8.4 in | 8.4 in | −0.01 in |
| Circumference | 103.1 in | 103.1 in | −0.1 in |
| Revolutions per mile | 614 | 615 | +0 |
| Ride height | −0.01 in |
Speedometer
With 305/70R16 fitted, a speedometer set up for 285/75R16 shows the first number when you are really doing the second.
- 3030.0 mph
- 4545.0 mph
- 6060.0 mph
- 7575.0 mph
The two sizes
285/75R16 is 32.8 inches tall with a 8.4-inch sidewall. 305/70R16 is 32.8 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, 285/75R16 or 305/70R16?
285/75R16 is taller: 32.8 inches against 32.8. 305/70R16 is wider, at 305 mm.
Can I replace 285/75R16 with 305/70R16?
On height, yes: the difference is 0.1%, 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 305/70R16 on a vehicle set up for 285/75R16, the speedometer shows 60 mph at a true 60.0 mph, and 70 at 70.0.