Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-30 | 38/15.5-30 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.44 (951) | 38.07 (966.88) | 0.63 (15.88) 1.7% |
| Width inches (mm) | 12.4 (315) | 15.51 (394) | 3.11 (79) 25.1% |
| Circum. inches (mm) | 117.62 (2987.65) | 119.59 (3037.54) | 1.96 (49.89) 1.7% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 4.03 (102.44) | 0.31 (7.94) 8.4% |
| Revolutions per mile (km) | 538.66 (334.71) | 529.82 (329.21) | -8.85 (-5.5) -1.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.33 mph (32.72 km/h) |
| 25 mph (40.23 km/h) | 25.42 mph (40.91 km/h) |
| 30 mph (48.28 km/h) | 30.5 mph (49.09 km/h) |
| 35 mph (56.33 km/h) | 35.58 mph (57.27 km/h) |
| 40 mph (64.37 km/h) | 40.67 mph (65.45 km/h) |
| 45 mph (72.42 km/h) | 45.75 mph (73.63 km/h) |
| 50 mph (80.47 km/h) | 50.83 mph (81.81 km/h) |
| 55 mph (88.51 km/h) | 55.92 mph (89.99 km/h) |
| 60 mph (96.56 km/h) | 61 mph (98.17 km/h) |
| 65 mph (104.61 km/h) | 66.09 mph (106.35 km/h) |
| 70 mph (112.65 km/h) | 71.17 mph (114.54 km/h) |
| 75 mph (120.7 km/h) | 76.25 mph (122.72 km/h) |
| 80 mph (128.75 km/h) | 81.34 mph (130.9 km/h) |
| 85 mph (136.79 km/h) | 86.42 mph (139.08 km/h) |
| 90 mph (144.84 km/h) | 91.5 mph (147.26 km/h) |
| 95 mph (152.89 km/h) | 96.59 mph (155.44 km/h) |
| 100 mph (160.93 km/h) | 101.67 mph (163.62 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1348 | 1566 | 1687 | 1761 | 1842 | 1899 | 1962 | 2037 | 2140 | 2243 | 2358 | 2450 | 2616 | 2800 | 2943 | 3035 | 3087 | 3276 | 3540 | 4114 |
Better Fuel Economy Factory Ratios Increased Power
