Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/70-18 | 315/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.91 (912.2) | 32.88 (835.2) | -3.03 (-77) -8.4% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 112.83 (2865.76) | 103.3 (2623.86) | -9.52 (-241.9) -8.4% |
| Sidewall Height inches (mm) | 8.96 (227.5) | 7.44 (189) | -1.52 (-38.5) -16.9% |
| Revolutions per mile (km) | 561.58 (348.95) | 613.35 (381.12) | 51.77 (32.17) 9.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.31 mph (29.47 km/h) |
| 25 mph (40.23 km/h) | 22.89 mph (36.84 km/h) |
| 30 mph (48.28 km/h) | 27.47 mph (44.2 km/h) |
| 35 mph (56.33 km/h) | 32.05 mph (51.57 km/h) |
| 40 mph (64.37 km/h) | 36.62 mph (58.94 km/h) |
| 45 mph (72.42 km/h) | 41.2 mph (66.31 km/h) |
| 50 mph (80.47 km/h) | 45.78 mph (73.67 km/h) |
| 55 mph (88.51 km/h) | 50.36 mph (81.04 km/h) |
| 60 mph (96.56 km/h) | 54.94 mph (88.41 km/h) |
| 65 mph (104.61 km/h) | 59.51 mph (95.78 km/h) |
| 70 mph (112.65 km/h) | 64.09 mph (103.14 km/h) |
| 75 mph (120.7 km/h) | 68.67 mph (110.51 km/h) |
| 80 mph (128.75 km/h) | 73.25 mph (117.88 km/h) |
| 85 mph (136.79 km/h) | 77.83 mph (125.25 km/h) |
| 90 mph (144.84 km/h) | 82.4 mph (132.61 km/h) |
| 95 mph (152.89 km/h) | 86.98 mph (139.98 km/h) |
| 100 mph (160.93 km/h) | 91.56 mph (147.35 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
