245/75R17 vs 265/70R17: full comparison
| Measurement | 245/75R17 | 265/70R17 | Difference |
|---|---|---|---|
| Diameter | 31.47 in | 31.61 in | +0.14 in+0.4% |
| Section width | 9.65 in | 10.43 in | +0.79 in+8.2% |
| Sidewall height | 7.23 in | 7.30 in | +0.07 in+1.0% |
| Circumference | 98.86 in | 99.29 in | +0.43 in+0.4% |
| Revs per mile | 641 | 638 | −3−0.4% |
Speedometer: indicated vs actual speed
With 265/70R17 fitted where 245/75R17 was the stock/calibrated size:
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 20.1 mph | +0.1 mph |
| 30 mph | 30.1 mph | +0.1 mph |
| 40 mph | 40.2 mph | +0.2 mph |
| 50 mph | 50.2 mph | +0.2 mph |
| 55 mph | 55.2 mph | +0.2 mph |
| 60 mph | 60.3 mph | +0.3 mph |
| 65 mph | 65.3 mph | +0.3 mph |
| 70 mph | 70.3 mph | +0.3 mph |
| 75 mph | 75.3 mph | +0.3 mph |
| 80 mph | 80.4 mph | +0.4 mph |
Recalculate for a gear ratio change too →
Will 265/70R17 fit where 245/75R17 was?
245/75R17 and 265/70R17 are essentially the same overall height (+0.4%), so this is usually a straightforward swap as far as fitment goes -- the main thing to check is wheel width and offset, not diameter.
Related tire size comparisons
- 265/70R17 vs 285/70R17
- 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 265/70R17 than 245/75R17?
265/70R17 is 0.14 in taller in overall diameter (+0.4%) and 0.79 in wider in section width (+8.2%) than 245/75R17.
Will 265/70R17 fit in place of 245/75R17?
245/75R17 and 265/70R17 are essentially the same overall height (+0.4%), so this is usually a straightforward swap as far as fitment goes -- the main thing to check is wheel width and offset, not diameter.
Does swapping to 265/70R17 affect my speedometer?
With 265/70R17 fitted where 245/75R17 was calibrated, an indicated 60 mph is really about 60.3 mph. That small a difference is within the ±3% most shops treat as close enough not to recalibrate.
Does 265/70R17 change the ride height?
Yes -- half the diameter difference shows up at the axle, so 265/70R17 changes ride height by about 0.07 in higher compared with 245/75R17.
Do 245/75R17 and 265/70R17 use the same wheel (rim) diameter?
Yes -- both fit a 17 inch wheel, so only the tire itself changes, not the wheel.