ElpiAuto35X12.50R15 vs 235/75R15
235/75R15 is 6.12″ (156 mm) shorter than 35X12.50R15, a 17.5% difference in overall diameter — outside the ±3% band, so expect the speedometer to drift and check for rubbing before fitting.
The section widths are very different — these are not a like-for-like swap. Confirm wheel width and arch clearance separately.
| Measurement | 35X12.50R15 | 235/75R15 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 35.00″ | 28.88″ | −6.12″ | −17.5% |
| Section width | 12.50″ | 9.25″ | −3.25″ | −26.0% |
| Sidewall height | 10.00″ | 6.94″ | −3.06″ | −30.6% |
| Circumference | 109.96″ | 90.72″ | −19.23″ | −17.5% |
| Revs per mile | 576.2 | 698.4 | +122.2 | +21.2% |
| Revs per km | 358.1 | 434.0 | +75.9 | +21.2% |
Speedometer: with 35X12.50R15 as the original, 235/75R15 makes an indicated 60 mph really about 49.5 mph, and the axle sits ~3.06″ lower.
Reading this comparison
The overall diameter is what matters here: 35X12.50R15 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.