ElpiAuto235/85R16 vs 245/75R16
245/75R16 is 1.26″ (32 mm) shorter than 235/85R16, a 4.0% difference in overall diameter — outside the ±3% band, so expect the speedometer to drift and check for rubbing before fitting.
| Measurement | 235/85R16 | 245/75R16 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 31.73″ | 30.47″ | −1.26″ | −4.0% |
| Section width | 9.25″ | 9.65″ | +0.39″ | +4.3% |
| Sidewall height | 7.86″ | 7.23″ | −0.63″ | −8.0% |
| Circumference | 99.68″ | 95.72″ | −3.96″ | −4.0% |
| Revs per mile | 635.6 | 661.9 | +26.3 | +4.1% |
| Revs per km | 395.0 | 411.3 | +16.3 | +4.1% |
Speedometer: with 235/85R16 as the original, 245/75R16 makes an indicated 60 mph really about 57.6 mph, and the axle sits ~0.63″ lower.
Reading this comparison
The overall diameter is what matters here: 235/85R16 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.