ElpiAuto295/60R20 vs 315/60R20
315/60R20 is 0.94″ (24 mm) taller than 295/60R20, a 2.8% 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 | 295/60R20 | 315/60R20 | Difference | % |
|---|---|---|---|---|
| Overall diameter | 33.94″ | 34.88″ | +0.94″ | +2.8% |
| Section width | 11.61″ | 12.40″ | +0.79″ | +6.8% |
| Sidewall height | 6.97″ | 7.44″ | +0.47″ | +6.8% |
| Circumference | 106.62″ | 109.58″ | +2.97″ | +2.8% |
| Revs per mile | 594.3 | 578.2 | −16.1 | −2.7% |
| Revs per km | 369.3 | 359.3 | −10.0 | −2.7% |
Speedometer: with 295/60R20 as the original, 315/60R20 makes an indicated 60 mph really about 61.7 mph, and the axle sits ~0.47″ higher.
Reading this comparison
The overall diameter is what matters here: 315/60R20 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.