Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/55-18 | 315/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.01 (660.7) | 34.36 (872.8) | 8.35 (212.1) 32.1% |
| Width inches (mm) | 7.28 (185) | 12.4 (315) | 5.12 (130) 70.3% |
| Circum. inches (mm) | 81.72 (2075.65) | 107.95 (2741.98) | 26.23 (666.33) 32.1% |
| Sidewall Height inches (mm) | 4.01 (101.75) | 8.68 (220.5) | 4.68 (118.75) 116.7% |
| Revolutions per mile (km) | 775.34 (481.78) | 586.93 (364.7) | -188.42 (-117.08) -24.3% |
315/70-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.42 mph (42.52 km/h) |
| 25 mph (40.23 km/h) | 33.03 mph (53.15 km/h) |
| 30 mph (48.28 km/h) | 39.63 mph (63.78 km/h) |
| 35 mph (56.33 km/h) | 46.24 mph (74.41 km/h) |
| 40 mph (64.37 km/h) | 52.84 mph (85.04 km/h) |
| 45 mph (72.42 km/h) | 59.45 mph (95.67 km/h) |
| 50 mph (80.47 km/h) | 66.05 mph (106.3 km/h) |
| 55 mph (88.51 km/h) | 72.66 mph (116.93 km/h) |
| 60 mph (96.56 km/h) | 79.26 mph (127.56 km/h) |
| 65 mph (104.61 km/h) | 85.87 mph (138.19 km/h) |
| 70 mph (112.65 km/h) | 92.47 mph (148.82 km/h) |
| 75 mph (120.7 km/h) | 99.08 mph (159.45 km/h) |
| 80 mph (128.75 km/h) | 105.68 mph (170.08 km/h) |
| 85 mph (136.79 km/h) | 112.29 mph (180.71 km/h) |
| 90 mph (144.84 km/h) | 118.89 mph (191.34 km/h) |
| 95 mph (152.89 km/h) | 125.5 mph (201.97 km/h) |
| 100 mph (160.93 km/h) | 132.1 mph (212.6 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 |
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