Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-30 | 315/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.44 (951) | 32.88 (835.2) | -4.56 (-115.8) -12.2% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 117.62 (2987.65) | 103.3 (2623.86) | -14.32 (-363.8) -12.2% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 7.44 (189) | 3.72 (94.5) 100% |
| Revolutions per mile (km) | 538.66 (334.71) | 613.35 (381.12) | 74.69 (46.41) 13.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.56 mph (28.27 km/h) |
| 25 mph (40.23 km/h) | 21.96 mph (35.33 km/h) |
| 30 mph (48.28 km/h) | 26.35 mph (42.4 km/h) |
| 35 mph (56.33 km/h) | 30.74 mph (49.47 km/h) |
| 40 mph (64.37 km/h) | 35.13 mph (56.54 km/h) |
| 45 mph (72.42 km/h) | 39.52 mph (63.6 km/h) |
| 50 mph (80.47 km/h) | 43.91 mph (70.67 km/h) |
| 55 mph (88.51 km/h) | 48.3 mph (77.74 km/h) |
| 60 mph (96.56 km/h) | 52.69 mph (84.8 km/h) |
| 65 mph (104.61 km/h) | 57.09 mph (91.87 km/h) |
| 70 mph (112.65 km/h) | 61.48 mph (98.94 km/h) |
| 75 mph (120.7 km/h) | 65.87 mph (106 km/h) |
| 80 mph (128.75 km/h) | 70.26 mph (113.07 km/h) |
| 85 mph (136.79 km/h) | 74.65 mph (120.14 km/h) |
| 90 mph (144.84 km/h) | 79.04 mph (127.2 km/h) |
| 95 mph (152.89 km/h) | 83.43 mph (134.27 km/h) |
| 100 mph (160.93 km/h) | 87.82 mph (141.34 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1561 | 1813 | 1953 | 2039 | 2132 | 2198 | 2272 | 2358 | 2477 | 2597 | 2730 | 2836 | 3029 | 3241 | 3407 | 3514 | 3573 | 3793 | 4098 | 4762 |
Better Fuel Economy Factory Ratios Increased Power
