Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-20 | 315/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 31.16 (791.5) | 4.96 (126) 18.9% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 82.31 (2090.73) | 97.9 (2486.57) | 15.58 (395.84) 18.9% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 5.58 (141.75) | 2.48 (63) 80% |
| Revolutions per mile (km) | 769.75 (478.3) | 647.21 (402.16) | -122.54 (-76.14) -15.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.79 mph (38.28 km/h) |
| 25 mph (40.23 km/h) | 29.73 mph (47.85 km/h) |
| 30 mph (48.28 km/h) | 35.68 mph (57.42 km/h) |
| 35 mph (56.33 km/h) | 41.63 mph (66.99 km/h) |
| 40 mph (64.37 km/h) | 47.57 mph (76.56 km/h) |
| 45 mph (72.42 km/h) | 53.52 mph (86.13 km/h) |
| 50 mph (80.47 km/h) | 59.47 mph (95.7 km/h) |
| 55 mph (88.51 km/h) | 65.41 mph (105.27 km/h) |
| 60 mph (96.56 km/h) | 71.36 mph (114.84 km/h) |
| 65 mph (104.61 km/h) | 77.31 mph (124.41 km/h) |
| 70 mph (112.65 km/h) | 83.25 mph (133.98 km/h) |
| 75 mph (120.7 km/h) | 89.2 mph (143.55 km/h) |
| 80 mph (128.75 km/h) | 95.15 mph (153.12 km/h) |
| 85 mph (136.79 km/h) | 101.09 mph (162.69 km/h) |
| 90 mph (144.84 km/h) | 107.04 mph (172.26 km/h) |
| 95 mph (152.89 km/h) | 112.99 mph (181.83 km/h) |
| 100 mph (160.93 km/h) | 118.93 mph (191.4 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1647 | 1913 | 2061 | 2152 | 2250 | 2320 | 2397 | 2488 | 2614 | 2740 | 2881 | 2993 | 3196 | 3420 | 3595 | 3708 | 3771 | 4002 | 4324 | 5025 |
Better Fuel Economy Factory Ratios Increased Power
