ElpiAuto265/75R16 vs 315/75R16
315/75R16 is 2.95″ (75 mm) taller than 265/75R16, a 9.3% difference in overall diameter — outside the ±3% band, so expect the speedometer to drift and check for rubbing before fitting.
| Measurement | 265/75R16 | 315/75R16 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 31.65″ | 34.60″ | +2.95″ | +9.3% |
| Section width | 10.43″ | 12.40″ | +1.97″ | +18.9% |
| Sidewall height | 7.82″ | 9.30″ | +1.48″ | +18.9% |
| Circumference | 99.43″ | 108.71″ | +9.28″ | +9.3% |
| Revs per mile | 637.2 | 582.9 | −54.4 | −8.5% |
| Revs per km | 396.0 | 362.2 | −33.8 | −8.5% |
Speedometer: with 265/75R16 as the original, 315/75R16 makes an indicated 60 mph really about 65.6 mph, and the axle sits ~1.48″ higher.
Reading this comparison
The overall diameter is what matters here: 315/75R16 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.