Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/45-17 | 305/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.52 (724.3) | 28.41 (721.5) | -0.11 (-2.8) -0.4% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 89.58 (2275.46) | 89.24 (2266.66) | -0.35 (-8.8) -0.4% |
| Sidewall Height inches (mm) | 5.76 (146.25) | 4.2 (106.75) | -1.56 (-39.5) -27% |
| Revolutions per mile (km) | 707.26 (439.47) | 710.01 (441.18) | 2.74 (1.71) 0.4% |
305/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.92 mph (32.06 km/h) |
| 25 mph (40.23 km/h) | 24.9 mph (40.08 km/h) |
| 30 mph (48.28 km/h) | 29.88 mph (48.09 km/h) |
| 35 mph (56.33 km/h) | 34.86 mph (56.11 km/h) |
| 40 mph (64.37 km/h) | 39.85 mph (64.13 km/h) |
| 45 mph (72.42 km/h) | 44.83 mph (72.14 km/h) |
| 50 mph (80.47 km/h) | 49.81 mph (80.16 km/h) |
| 55 mph (88.51 km/h) | 54.79 mph (88.17 km/h) |
| 60 mph (96.56 km/h) | 59.77 mph (96.19 km/h) |
| 65 mph (104.61 km/h) | 64.75 mph (104.2 km/h) |
| 70 mph (112.65 km/h) | 69.73 mph (112.22 km/h) |
| 75 mph (120.7 km/h) | 74.71 mph (120.23 km/h) |
| 80 mph (128.75 km/h) | 79.69 mph (128.25 km/h) |
| 85 mph (136.79 km/h) | 84.67 mph (136.27 km/h) |
| 90 mph (144.84 km/h) | 89.65 mph (144.28 km/h) |
| 95 mph (152.89 km/h) | 94.63 mph (152.3 km/h) |
| 100 mph (160.93 km/h) | 99.61 mph (160.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1807 | 2099 | 2260 | 2360 | 2468 | 2545 | 2630 | 2729 | 2868 | 3006 | 3160 | 3283 | 3506 | 3752 | 3944 | 4067 | 4136 | 4390 | 4744 | 5513 |
Better Fuel Economy Factory Ratios Increased Power
