Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-30 | 38/13.5-28 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.44 (951) | 37.99 (965.02) | 0.55 (14.02) 1.5% |
| Width inches (mm) | 12.4 (315) | 13.5 (343) | 1.1 (28) 8.9% |
| Circum. inches (mm) | 117.62 (2987.65) | 119.36 (3031.7) | 1.73 (44.05) 1.5% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 5 (126.91) | 1.28 (32.41) 34.3% |
| Revolutions per mile (km) | 538.66 (334.71) | 530.84 (329.85) | -7.83 (-4.86) -1.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.29 mph (32.66 km/h) |
| 25 mph (40.23 km/h) | 25.37 mph (40.83 km/h) |
| 30 mph (48.28 km/h) | 30.44 mph (48.99 km/h) |
| 35 mph (56.33 km/h) | 35.52 mph (57.16 km/h) |
| 40 mph (64.37 km/h) | 40.59 mph (65.32 km/h) |
| 45 mph (72.42 km/h) | 45.66 mph (73.49 km/h) |
| 50 mph (80.47 km/h) | 50.74 mph (81.65 km/h) |
| 55 mph (88.51 km/h) | 55.81 mph (89.82 km/h) |
| 60 mph (96.56 km/h) | 60.88 mph (97.98 km/h) |
| 65 mph (104.61 km/h) | 65.96 mph (106.15 km/h) |
| 70 mph (112.65 km/h) | 71.03 mph (114.32 km/h) |
| 75 mph (120.7 km/h) | 76.11 mph (122.48 km/h) |
| 80 mph (128.75 km/h) | 81.18 mph (130.65 km/h) |
| 85 mph (136.79 km/h) | 86.25 mph (138.81 km/h) |
| 90 mph (144.84 km/h) | 91.33 mph (146.98 km/h) |
| 95 mph (152.89 km/h) | 96.4 mph (155.14 km/h) |
| 100 mph (160.93 km/h) | 101.47 mph (163.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1351 | 1569 | 1690 | 1765 | 1845 | 1903 | 1966 | 2041 | 2144 | 2248 | 2363 | 2455 | 2621 | 2805 | 2949 | 3041 | 3093 | 3282 | 3547 | 4122 |
Better Fuel Economy Factory Ratios Increased Power
