285/75R16 vs 315/75R16: full comparison
| Measurement | 285/75R16 | 315/75R16 | Difference |
|---|---|---|---|
| Diameter | 32.83 in | 34.60 in | +1.77 in+5.4% |
| Section width | 11.22 in | 12.40 in | +1.18 in+10.5% |
| Sidewall height | 8.42 in | 9.30 in | +0.89 in+10.5% |
| Circumference | 103.14 in | 108.71 in | +5.57 in+5.4% |
| Revs per mile | 614 | 583 | −31−5.1% |
Speedometer: indicated vs actual speed
With 315/75R16 fitted where 285/75R16 was the stock/calibrated size:
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 21.1 mph | +1.1 mph |
| 30 mph | 31.6 mph | +1.6 mph |
| 40 mph | 42.2 mph | +2.2 mph |
| 50 mph | 52.7 mph | +2.7 mph |
| 55 mph | 58.0 mph | +3.0 mph |
| 60 mph | 63.2 mph | +3.2 mph |
| 65 mph | 68.5 mph | +3.5 mph |
| 70 mph | 73.8 mph | +3.8 mph |
| 75 mph | 79.0 mph | +4.0 mph |
| 80 mph | 84.3 mph | +4.3 mph |
Recalculate for a gear ratio change too →
Will 315/75R16 fit where 285/75R16 was?
At +5.4%, 315/75R16 is enough larger than 285/75R16 that it commonly needs some accommodation -- trimming plastic liners/fender edges, a spacer, or a leveling kit on trucks/SUVs going bigger. Check clearance at full steering lock and full suspension compression before buying.
Related tire size comparisons
- 265/75R16 vs 285/75R16
- 285/75R16 vs 305/70R16
- 255/85R16 vs 285/75R16
- 245/75R16 vs 285/75R16
- 285/70R17 vs 285/75R16
More tire tools
- Tire size comparison tool: compare any two sizes yourself, including flotation sizes.
- Tire size calculator: full dimensions of one size, plus every equivalent size within 3%.
- Speedometer calculator: true speed after a tire or gear ratio change.
Frequently asked questions
How much bigger is 315/75R16 than 285/75R16?
315/75R16 is 1.77 in taller in overall diameter (+5.4%) and 1.18 in wider in section width (+10.5%) than 285/75R16.
Will 315/75R16 fit in place of 285/75R16?
At +5.4%, 315/75R16 is enough larger than 285/75R16 that it commonly needs some accommodation -- trimming plastic liners/fender edges, a spacer, or a leveling kit on trucks/SUVs going bigger. Check clearance at full steering lock and full suspension compression before buying.
Does swapping to 315/75R16 affect my speedometer?
With 315/75R16 fitted where 285/75R16 was calibrated, an indicated 60 mph is really about 63.2 mph. Beyond the ±3% guideline, plan to recalibrate the speedometer/odometer (with a programmer or at the dealer) for an accurate reading.
Does 315/75R16 change the ride height?
Yes -- half the diameter difference shows up at the axle, so 315/75R16 changes ride height by about 0.89 in higher compared with 285/75R16.
Do 285/75R16 and 315/75R16 use the same wheel (rim) diameter?
Yes -- both fit a 16 inch wheel, so only the tire itself changes, not the wheel.