Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-20 | 315/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 37.36 (949) | 11.16 (283.5) 42.6% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 82.31 (2090.73) | 117.38 (2981.37) | 35.06 (890.64) 42.6% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 8.68 (220.5) | 5.58 (141.75) 180% |
| Revolutions per mile (km) | 769.75 (478.3) | 539.8 (335.42) | -229.95 (-142.89) -29.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 28.52 mph (45.9 km/h) |
| 25 mph (40.23 km/h) | 35.65 mph (57.37 km/h) |
| 30 mph (48.28 km/h) | 42.78 mph (68.85 km/h) |
| 35 mph (56.33 km/h) | 49.91 mph (80.32 km/h) |
| 40 mph (64.37 km/h) | 57.04 mph (91.8 km/h) |
| 45 mph (72.42 km/h) | 64.17 mph (103.27 km/h) |
| 50 mph (80.47 km/h) | 71.3 mph (114.75 km/h) |
| 55 mph (88.51 km/h) | 78.43 mph (126.22 km/h) |
| 60 mph (96.56 km/h) | 85.56 mph (137.7 km/h) |
| 65 mph (104.61 km/h) | 92.69 mph (149.17 km/h) |
| 70 mph (112.65 km/h) | 99.82 mph (160.64 km/h) |
| 75 mph (120.7 km/h) | 106.95 mph (172.12 km/h) |
| 80 mph (128.75 km/h) | 114.08 mph (183.59 km/h) |
| 85 mph (136.79 km/h) | 121.21 mph (195.07 km/h) |
| 90 mph (144.84 km/h) | 128.34 mph (206.54 km/h) |
| 95 mph (152.89 km/h) | 135.47 mph (218.02 km/h) |
| 100 mph (160.93 km/h) | 142.6 mph (229.49 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1374 | 1596 | 1719 | 1795 | 1876 | 1935 | 1999 | 2075 | 2180 | 2286 | 2402 | 2496 | 2666 | 2853 | 2999 | 3092 | 3145 | 3338 | 3607 | 4191 |
Better Fuel Economy Factory Ratios Increased Power
