Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 315/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 34.36 (872.8) | -3.63 (-92.24) -9.6% |
| Width inches (mm) | 15.51 (394) | 12.4 (315) | -3.11 (-79) -20.1% |
| Circum. inches (mm) | 119.36 (3031.76) | 107.95 (2741.98) | -11.41 (-289.78) -9.6% |
| Sidewall Height inches (mm) | 9 (228.52) | 8.68 (220.5) | -0.32 (-8.02) -3.5% |
| Revolutions per mile (km) | 530.83 (329.84) | 586.93 (364.7) | 56.1 (34.86) 10.6% |
315/70-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.09 mph (29.11 km/h) |
| 25 mph (40.23 km/h) | 22.61 mph (36.39 km/h) |
| 30 mph (48.28 km/h) | 27.13 mph (43.67 km/h) |
| 35 mph (56.33 km/h) | 31.65 mph (50.94 km/h) |
| 40 mph (64.37 km/h) | 36.18 mph (58.22 km/h) |
| 45 mph (72.42 km/h) | 40.7 mph (65.5 km/h) |
| 50 mph (80.47 km/h) | 45.22 mph (72.78 km/h) |
| 55 mph (88.51 km/h) | 49.74 mph (80.05 km/h) |
| 60 mph (96.56 km/h) | 54.27 mph (87.33 km/h) |
| 65 mph (104.61 km/h) | 58.79 mph (94.61 km/h) |
| 70 mph (112.65 km/h) | 63.31 mph (101.89 km/h) |
| 75 mph (120.7 km/h) | 67.83 mph (109.16 km/h) |
| 80 mph (128.75 km/h) | 72.35 mph (116.44 km/h) |
| 85 mph (136.79 km/h) | 76.88 mph (123.72 km/h) |
| 90 mph (144.84 km/h) | 81.4 mph (131 km/h) |
| 95 mph (152.89 km/h) | 85.92 mph (138.27 km/h) |
| 100 mph (160.93 km/h) | 90.44 mph (145.55 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1494 | 1735 | 1869 | 1951 | 2040 | 2104 | 2174 | 2256 | 2371 | 2485 | 2612 | 2714 | 2898 | 3102 | 3261 | 3362 | 3419 | 3629 | 3922 | 4557 |
Better Fuel Economy Factory Ratios Increased Power
