Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-18 | 315/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.81 (731.7) | 28.68 (728.5) | -0.13 (-3.2) -0.4% |
| Width inches (mm) | 12.01 (305) | 12.4 (315) | 0.39 (10) 3.3% |
| Circum. inches (mm) | 90.5 (2298.7) | 90.1 (2288.65) | -0.4 (-10.05) -0.4% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 4.34 (110.25) | -1.06 (-27) -19.7% |
| Revolutions per mile (km) | 700.11 (435.03) | 703.18 (436.94) | 3.08 (1.91) 0.4% |
315/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.91 mph (32.05 km/h) |
| 25 mph (40.23 km/h) | 24.89 mph (40.06 km/h) |
| 30 mph (48.28 km/h) | 29.87 mph (48.07 km/h) |
| 35 mph (56.33 km/h) | 34.85 mph (56.08 km/h) |
| 40 mph (64.37 km/h) | 39.83 mph (64.09 km/h) |
| 45 mph (72.42 km/h) | 44.8 mph (72.1 km/h) |
| 50 mph (80.47 km/h) | 49.78 mph (80.12 km/h) |
| 55 mph (88.51 km/h) | 54.76 mph (88.13 km/h) |
| 60 mph (96.56 km/h) | 59.74 mph (96.14 km/h) |
| 65 mph (104.61 km/h) | 64.72 mph (104.15 km/h) |
| 70 mph (112.65 km/h) | 69.69 mph (112.16 km/h) |
| 75 mph (120.7 km/h) | 74.67 mph (120.17 km/h) |
| 80 mph (128.75 km/h) | 79.65 mph (128.18 km/h) |
| 85 mph (136.79 km/h) | 84.63 mph (136.2 km/h) |
| 90 mph (144.84 km/h) | 89.61 mph (144.21 km/h) |
| 95 mph (152.89 km/h) | 94.58 mph (152.22 km/h) |
| 100 mph (160.93 km/h) | 99.56 mph (160.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1789 | 2079 | 2239 | 2338 | 2444 | 2520 | 2604 | 2703 | 2840 | 2977 | 3130 | 3252 | 3472 | 3716 | 3906 | 4028 | 4097 | 4348 | 4698 | 5460 |
Better Fuel Economy Factory Ratios Increased Power
