Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 315/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 37.36 (949) | -0.63 (-16.04) -1.7% |
| Width inches (mm) | 15.51 (394) | 12.4 (315) | -3.11 (-79) -20.1% |
| Circum. inches (mm) | 119.36 (3031.76) | 117.38 (2981.37) | -1.98 (-50.39) -1.7% |
| 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) | 539.8 (335.42) | 8.97 (5.57) 1.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.67 mph (31.65 km/h) |
| 25 mph (40.23 km/h) | 24.58 mph (39.56 km/h) |
| 30 mph (48.28 km/h) | 29.5 mph (47.48 km/h) |
| 35 mph (56.33 km/h) | 34.42 mph (55.39 km/h) |
| 40 mph (64.37 km/h) | 39.34 mph (63.3 km/h) |
| 45 mph (72.42 km/h) | 44.25 mph (71.22 km/h) |
| 50 mph (80.47 km/h) | 49.17 mph (79.13 km/h) |
| 55 mph (88.51 km/h) | 54.09 mph (87.04 km/h) |
| 60 mph (96.56 km/h) | 59 mph (94.96 km/h) |
| 65 mph (104.61 km/h) | 63.92 mph (102.87 km/h) |
| 70 mph (112.65 km/h) | 68.84 mph (110.78 km/h) |
| 75 mph (120.7 km/h) | 73.75 mph (118.69 km/h) |
| 80 mph (128.75 km/h) | 78.67 mph (126.61 km/h) |
| 85 mph (136.79 km/h) | 83.59 mph (134.52 km/h) |
| 90 mph (144.84 km/h) | 88.5 mph (142.43 km/h) |
| 95 mph (152.89 km/h) | 93.42 mph (150.35 km/h) |
| 100 mph (160.93 km/h) | 98.34 mph (158.26 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1374 | 1596 | 1719 | 1795 | 1876 | 1935 | 1999 | 2075 | 2180 | 2286 | 2402 | 2496 | 2666 | 2853 | 2999 | 3092 | 3145 | 3338 | 3607 | 4191 |
Better Fuel Economy Factory Ratios Increased Power
