265/70R17 vs 285/70R17: full comparison
| Measurement | 265/70R17 | 285/70R17 | Difference |
|---|---|---|---|
| Diameter | 31.61 in | 32.71 in | +1.10 in+3.5% |
| Section width | 10.43 in | 11.22 in | +0.79 in+7.5% |
| Sidewall height | 7.30 in | 7.85 in | +0.55 in+7.5% |
| Circumference | 99.29 in | 102.76 in | +3.46 in+3.5% |
| Revs per mile | 638 | 617 | −22−3.4% |
Speedometer: indicated vs actual speed
With 285/70R17 fitted where 265/70R17 was the stock/calibrated size:
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 20.7 mph | +0.7 mph |
| 30 mph | 31.0 mph | +1.0 mph |
| 40 mph | 41.4 mph | +1.4 mph |
| 50 mph | 51.7 mph | +1.7 mph |
| 55 mph | 56.9 mph | +1.9 mph |
| 60 mph | 62.1 mph | +2.1 mph |
| 65 mph | 67.3 mph | +2.3 mph |
| 70 mph | 72.4 mph | +2.4 mph |
| 75 mph | 77.6 mph | +2.6 mph |
| 80 mph | 82.8 mph | +2.8 mph |
Recalculate for a gear ratio change too →
Will 285/70R17 fit where 265/70R17 was?
At +3.5%, 285/70R17 is enough larger than 265/70R17 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
- 245/75R17 vs 265/70R17
- 265/65R17 vs 265/70R17
- 245/70R17 vs 265/70R17
- 255/75R17 vs 265/70R17
- 265/70R17 vs 275/70R17
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 285/70R17 than 265/70R17?
285/70R17 is 1.10 in taller in overall diameter (+3.5%) and 0.79 in wider in section width (+7.5%) than 265/70R17.
Will 285/70R17 fit in place of 265/70R17?
At +3.5%, 285/70R17 is enough larger than 265/70R17 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 285/70R17 affect my speedometer?
With 285/70R17 fitted where 265/70R17 was calibrated, an indicated 60 mph is really about 62.1 mph. Beyond the ±3% guideline, plan to recalibrate the speedometer/odometer (with a programmer or at the dealer) for an accurate reading.
Does 285/70R17 change the ride height?
Yes -- half the diameter difference shows up at the axle, so 285/70R17 changes ride height by about 0.55 in higher compared with 265/70R17.
Do 265/70R17 and 285/70R17 use the same wheel (rim) diameter?
Yes -- both fit a 17 inch wheel, so only the tire itself changes, not the wheel.