Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-30 | 37/17.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.44 (951) | 37.17 (944.1) | -0.27 (-6.9) -0.7% |
| Width inches (mm) | 12.4 (315) | 17.52 (445) | 5.12 (130) 41.3% |
| Circum. inches (mm) | 117.62 (2987.65) | 116.77 (2965.98) | -0.85 (-21.68) -0.7% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 8.58 (218.05) | 4.86 (123.55) 130.7% |
| Revolutions per mile (km) | 538.66 (334.71) | 542.6 (337.16) | 3.94 (2.45) 0.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.85 mph (31.95 km/h) |
| 25 mph (40.23 km/h) | 24.82 mph (39.94 km/h) |
| 30 mph (48.28 km/h) | 29.78 mph (47.93 km/h) |
| 35 mph (56.33 km/h) | 34.75 mph (55.92 km/h) |
| 40 mph (64.37 km/h) | 39.71 mph (63.91 km/h) |
| 45 mph (72.42 km/h) | 44.67 mph (71.9 km/h) |
| 50 mph (80.47 km/h) | 49.64 mph (79.88 km/h) |
| 55 mph (88.51 km/h) | 54.6 mph (87.87 km/h) |
| 60 mph (96.56 km/h) | 59.56 mph (95.86 km/h) |
| 65 mph (104.61 km/h) | 64.53 mph (103.85 km/h) |
| 70 mph (112.65 km/h) | 69.49 mph (111.84 km/h) |
| 75 mph (120.7 km/h) | 74.46 mph (119.83 km/h) |
| 80 mph (128.75 km/h) | 79.42 mph (127.81 km/h) |
| 85 mph (136.79 km/h) | 84.38 mph (135.8 km/h) |
| 90 mph (144.84 km/h) | 89.35 mph (143.79 km/h) |
| 95 mph (152.89 km/h) | 94.31 mph (151.78 km/h) |
| 100 mph (160.93 km/h) | 99.27 mph (159.77 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1381 | 1604 | 1727 | 1804 | 1886 | 1945 | 2010 | 2086 | 2192 | 2297 | 2415 | 2509 | 2679 | 2867 | 3014 | 3108 | 3161 | 3355 | 3625 | 4213 |
Better Fuel Economy Factory Ratios Increased Power
