Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-30 | 42/13.5-30 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.44 (951) | 41.88 (1063.84) | 4.44 (112.84) 11.9% |
| Width inches (mm) | 12.4 (315) | 13.5 (343) | 1.1 (28) 8.9% |
| Circum. inches (mm) | 117.62 (2987.65) | 131.58 (3342.15) | 13.96 (354.5) 11.9% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 5.94 (150.92) | 2.22 (56.42) 59.7% |
| Revolutions per mile (km) | 538.66 (334.71) | 481.53 (299.21) | -57.14 (-35.5) -10.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.37 mph (36.01 km/h) |
| 25 mph (40.23 km/h) | 27.97 mph (45.01 km/h) |
| 30 mph (48.28 km/h) | 33.56 mph (54.01 km/h) |
| 35 mph (56.33 km/h) | 39.15 mph (63.01 km/h) |
| 40 mph (64.37 km/h) | 44.75 mph (72.01 km/h) |
| 45 mph (72.42 km/h) | 50.34 mph (81.01 km/h) |
| 50 mph (80.47 km/h) | 55.93 mph (90.02 km/h) |
| 55 mph (88.51 km/h) | 61.53 mph (99.02 km/h) |
| 60 mph (96.56 km/h) | 67.12 mph (108.02 km/h) |
| 65 mph (104.61 km/h) | 72.71 mph (117.02 km/h) |
| 70 mph (112.65 km/h) | 78.31 mph (126.02 km/h) |
| 75 mph (120.7 km/h) | 83.9 mph (135.02 km/h) |
| 80 mph (128.75 km/h) | 89.49 mph (144.02 km/h) |
| 85 mph (136.79 km/h) | 95.09 mph (153.03 km/h) |
| 90 mph (144.84 km/h) | 100.68 mph (162.03 km/h) |
| 95 mph (152.89 km/h) | 106.27 mph (171.03 km/h) |
| 100 mph (160.93 km/h) | 111.87 mph (180.03 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1225 | 1424 | 1533 | 1601 | 1674 | 1726 | 1783 | 1851 | 1945 | 2039 | 2143 | 2227 | 2378 | 2545 | 2675 | 2758 | 2805 | 2977 | 3217 | 3739 |
Better Fuel Economy Factory Ratios Increased Power
