ElpiAuto235/75R17 vs 265/70R17
265/70R17 is 0.73″ (19 mm) taller than 235/75R17, a 2.4% difference in overall diameter — right at the edge of the ±3% band — fine on most cars, but check clearance at full lock and full suspension compression.
| Measurement | 235/75R17 | 265/70R17 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 30.88″ | 31.61″ | +0.73″ | +2.4% |
| Section width | 9.25″ | 10.43″ | +1.18″ | +12.8% |
| Sidewall height | 6.94″ | 7.30″ | +0.36″ | +5.2% |
| Circumference | 97.01″ | 99.29″ | +2.29″ | +2.4% |
| Revs per mile | 653.2 | 638.1 | −15.1 | −2.3% |
| Revs per km | 405.9 | 396.5 | −9.4 | −2.3% |
Speedometer: with 235/75R17 as the original, 265/70R17 makes an indicated 60 mph really about 61.4 mph, and the axle sits ~0.36″ higher.
Reading this comparison
The overall diameter is what matters here: 265/70R17 is the taller tire. It sets ride height, gearing and how far the tire travels per revolution — which is what the speedometer and odometer count. Width and sidewall change fit and feel (a wider tire needs a wider wheel and more clearance; a shorter sidewall sharpens steering) but not the gearing.
Figures are geometric estimates from the size codes; real moulded tires vary by brand by 1–3%. Confirm load rating, wheel width and physical clearance on your vehicle before fitting. To compare any other two sizes, use the tire size comparison tool; to decode one size and see what else fits its wheel, the tire size calculator.