Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/11.5-20 | 315/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.01 (940.16) | 36.12 (917.5) | -0.89 (-22.66) -2.4% |
| Width inches (mm) | 11.5 (292) | 12.4 (315) | 0.91 (23) 7.9% |
| Circum. inches (mm) | 116.28 (2953.6) | 113.48 (2882.41) | -2.8 (-71.19) -2.4% |
| Sidewall Height inches (mm) | 8.51 (216.08) | 8.06 (204.75) | -0.45 (-11.33) -5.2% |
| Revolutions per mile (km) | 544.88 (338.57) | 558.33 (346.93) | 13.46 (8.36) 2.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.52 mph (31.41 km/h) |
| 25 mph (40.23 km/h) | 24.4 mph (39.26 km/h) |
| 30 mph (48.28 km/h) | 29.28 mph (47.12 km/h) |
| 35 mph (56.33 km/h) | 34.16 mph (54.97 km/h) |
| 40 mph (64.37 km/h) | 39.04 mph (62.82 km/h) |
| 45 mph (72.42 km/h) | 43.92 mph (70.68 km/h) |
| 50 mph (80.47 km/h) | 48.79 mph (78.53 km/h) |
| 55 mph (88.51 km/h) | 53.67 mph (86.38 km/h) |
| 60 mph (96.56 km/h) | 58.55 mph (94.23 km/h) |
| 65 mph (104.61 km/h) | 63.43 mph (102.09 km/h) |
| 70 mph (112.65 km/h) | 68.31 mph (109.94 km/h) |
| 75 mph (120.7 km/h) | 73.19 mph (117.79 km/h) |
| 80 mph (128.75 km/h) | 78.07 mph (125.64 km/h) |
| 85 mph (136.79 km/h) | 82.95 mph (133.5 km/h) |
| 90 mph (144.84 km/h) | 87.83 mph (141.35 km/h) |
| 95 mph (152.89 km/h) | 92.71 mph (149.2 km/h) |
| 100 mph (160.93 km/h) | 97.59 mph (157.06 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1421 | 1651 | 1778 | 1856 | 1941 | 2001 | 2068 | 2146 | 2255 | 2364 | 2485 | 2582 | 2757 | 2951 | 3102 | 3198 | 3253 | 3452 | 3730 | 4335 |
Better Fuel Economy Factory Ratios Increased Power
