Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/40-17 | 285/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.92 (683.8) | 35.71 (907) | 8.79 (223.2) 32.6% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 84.58 (2148.22) | 112.18 (2849.42) | 27.61 (701.2) 32.6% |
| Sidewall Height inches (mm) | 4.96 (126) | 7.85 (199.5) | 2.89 (73.5) 58.3% |
| Revolutions per mile (km) | 749.15 (465.5) | 564.8 (350.95) | -184.36 (-114.55) -24.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.53 mph (42.69 km/h) |
| 25 mph (40.23 km/h) | 33.16 mph (53.37 km/h) |
| 30 mph (48.28 km/h) | 39.79 mph (64.04 km/h) |
| 35 mph (56.33 km/h) | 46.42 mph (74.71 km/h) |
| 40 mph (64.37 km/h) | 53.06 mph (85.39 km/h) |
| 45 mph (72.42 km/h) | 59.69 mph (96.06 km/h) |
| 50 mph (80.47 km/h) | 66.32 mph (106.73 km/h) |
| 55 mph (88.51 km/h) | 72.95 mph (117.41 km/h) |
| 60 mph (96.56 km/h) | 79.58 mph (128.08 km/h) |
| 65 mph (104.61 km/h) | 86.22 mph (138.75 km/h) |
| 70 mph (112.65 km/h) | 92.85 mph (149.43 km/h) |
| 75 mph (120.7 km/h) | 99.48 mph (160.1 km/h) |
| 80 mph (128.75 km/h) | 106.11 mph (170.77 km/h) |
| 85 mph (136.79 km/h) | 112.74 mph (181.45 km/h) |
| 90 mph (144.84 km/h) | 119.38 mph (192.12 km/h) |
| 95 mph (152.89 km/h) | 126.01 mph (202.79 km/h) |
| 100 mph (160.93 km/h) | 132.64 mph (213.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1437 | 1670 | 1798 | 1878 | 1963 | 2024 | 2092 | 2171 | 2281 | 2391 | 2514 | 2612 | 2789 | 2985 | 3138 | 3235 | 3290 | 3492 | 3774 | 4385 |
Better Fuel Economy Factory Ratios Increased Power
