Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-30 | 40/15.5-30 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.44 (951) | 39.93 (1014.16) | 2.49 (63.16) 6.6% |
| Width inches (mm) | 12.4 (315) | 15.51 (394) | 3.11 (79) 25.1% |
| Circum. inches (mm) | 117.62 (2987.65) | 125.44 (3186.08) | 7.81 (198.42) 6.6% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 4.96 (126.08) | 1.24 (31.58) 33.4% |
| Revolutions per mile (km) | 538.66 (334.71) | 505.12 (313.86) | -33.55 (-20.85) -6.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.33 mph (34.32 km/h) |
| 25 mph (40.23 km/h) | 26.66 mph (42.91 km/h) |
| 30 mph (48.28 km/h) | 31.99 mph (51.49 km/h) |
| 35 mph (56.33 km/h) | 37.32 mph (60.07 km/h) |
| 40 mph (64.37 km/h) | 42.66 mph (68.65 km/h) |
| 45 mph (72.42 km/h) | 47.99 mph (77.23 km/h) |
| 50 mph (80.47 km/h) | 53.32 mph (85.81 km/h) |
| 55 mph (88.51 km/h) | 58.65 mph (94.39 km/h) |
| 60 mph (96.56 km/h) | 63.98 mph (102.97 km/h) |
| 65 mph (104.61 km/h) | 69.32 mph (111.55 km/h) |
| 70 mph (112.65 km/h) | 74.65 mph (120.14 km/h) |
| 75 mph (120.7 km/h) | 79.98 mph (128.72 km/h) |
| 80 mph (128.75 km/h) | 85.31 mph (137.3 km/h) |
| 85 mph (136.79 km/h) | 90.65 mph (145.88 km/h) |
| 90 mph (144.84 km/h) | 95.98 mph (154.46 km/h) |
| 95 mph (152.89 km/h) | 101.31 mph (163.04 km/h) |
| 100 mph (160.93 km/h) | 106.64 mph (171.62 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1285 | 1493 | 1608 | 1679 | 1756 | 1811 | 1871 | 1942 | 2040 | 2139 | 2248 | 2336 | 2494 | 2669 | 2806 | 2894 | 2943 | 3123 | 3375 | 3922 |
Better Fuel Economy Factory Ratios Increased Power
