265/70R17 vs 35x12.50R17: full comparison
| Measurement | 265/70R17 | 35x12.50R17 | Difference |
|---|---|---|---|
| Diameter | 31.61 in | 35.00 in | +3.39 in+10.7% |
| Section width | 10.43 in | 12.50 in | +2.07 in+19.8% |
| Sidewall height | 7.30 in | 9.00 in | +1.70 in+23.2% |
| Circumference | 99.29 in | 109.96 in | +10.66 in+10.7% |
| Revs per mile | 638 | 576 | −62−9.7% |
Speedometer: indicated vs actual speed
With 35x12.50R17 fitted where 265/70R17 was the stock/calibrated size:
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 22.1 mph | +2.1 mph |
| 30 mph | 33.2 mph | +3.2 mph |
| 40 mph | 44.3 mph | +4.3 mph |
| 50 mph | 55.4 mph | +5.4 mph |
| 55 mph | 60.9 mph | +5.9 mph |
| 60 mph | 66.4 mph | +6.4 mph |
| 65 mph | 72.0 mph | +7.0 mph |
| 70 mph | 77.5 mph | +7.5 mph |
| 75 mph | 83.1 mph | +8.1 mph |
| 80 mph | 88.6 mph | +8.6 mph |
Recalculate for a gear ratio change too →
Will 35x12.50R17 fit where 265/70R17 was?
At +10.7%, this is a large change (well outside the ±3% guideline). Going larger by this much typically needs a lift and/or trimming, may need re-gearing (a numerically higher axle ratio) to recover acceleration and towing, and should be checked carefully for clearance and speedometer/ABS recalibration before buying.
Related tire size comparisons
- 265/70R17 vs 285/70R17
- 245/75R17 vs 265/70R17
- 265/65R17 vs 265/70R17
- 245/70R17 vs 265/70R17
- 255/75R17 vs 265/70R17
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 35x12.50R17 than 265/70R17?
35x12.50R17 is 3.39 in taller in overall diameter (+10.7%) and 2.07 in wider in section width (+19.8%) than 265/70R17.
Will 35x12.50R17 fit in place of 265/70R17?
At +10.7%, this is a large change (well outside the ±3% guideline). Going larger by this much typically needs a lift and/or trimming, may need re-gearing (a numerically higher axle ratio) to recover acceleration and towing, and should be checked carefully for clearance and speedometer/ABS recalibration before buying.
Does swapping to 35x12.50R17 affect my speedometer?
With 35x12.50R17 fitted where 265/70R17 was calibrated, an indicated 60 mph is really about 66.4 mph. Beyond the ±3% guideline, plan to recalibrate the speedometer/odometer (with a programmer or at the dealer) for an accurate reading.
Does 35x12.50R17 change the ride height?
Yes -- half the diameter difference shows up at the axle, so 35x12.50R17 changes ride height by about 1.70 in higher compared with 265/70R17.
Can I compare a metric size (like 265/70R17) with a flotation size (like 35x12.50R17)?
Yes -- both are converted to inches and millimeters before comparing, so the diameter, width and speedometer numbers above are directly comparable regardless of which sizing system each tire uses.