Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-30 | 37/11.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.44 (951) | 37.01 (940.16) | -0.43 (-10.84) -1.1% |
| Width inches (mm) | 12.4 (315) | 11.5 (292) | -0.91 (-23) -7.3% |
| Circum. inches (mm) | 117.62 (2987.65) | 116.28 (2953.6) | -1.34 (-34.05) -1.1% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 8.51 (216.08) | 4.79 (121.58) 128.7% |
| Revolutions per mile (km) | 538.66 (334.71) | 544.88 (338.57) | 6.21 (3.86) 1.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.77 mph (31.82 km/h) |
| 25 mph (40.23 km/h) | 24.72 mph (39.78 km/h) |
| 30 mph (48.28 km/h) | 29.66 mph (47.73 km/h) |
| 35 mph (56.33 km/h) | 34.6 mph (55.69 km/h) |
| 40 mph (64.37 km/h) | 39.54 mph (63.64 km/h) |
| 45 mph (72.42 km/h) | 44.49 mph (71.6 km/h) |
| 50 mph (80.47 km/h) | 49.43 mph (79.55 km/h) |
| 55 mph (88.51 km/h) | 54.37 mph (87.51 km/h) |
| 60 mph (96.56 km/h) | 59.32 mph (95.46 km/h) |
| 65 mph (104.61 km/h) | 64.26 mph (103.42 km/h) |
| 70 mph (112.65 km/h) | 69.2 mph (111.37 km/h) |
| 75 mph (120.7 km/h) | 74.15 mph (119.33 km/h) |
| 80 mph (128.75 km/h) | 79.09 mph (127.28 km/h) |
| 85 mph (136.79 km/h) | 84.03 mph (135.24 km/h) |
| 90 mph (144.84 km/h) | 88.97 mph (143.19 km/h) |
| 95 mph (152.89 km/h) | 93.92 mph (151.15 km/h) |
| 100 mph (160.93 km/h) | 98.86 mph (159.1 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1387 | 1611 | 1735 | 1811 | 1894 | 1953 | 2018 | 2095 | 2201 | 2307 | 2425 | 2519 | 2691 | 2879 | 3027 | 3121 | 3174 | 3369 | 3641 | 4231 |
Better Fuel Economy Factory Ratios Increased Power
