Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-20 | 305/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.68 (703) | 28.41 (721.5) | 0.73 (18.5) 2.6% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 86.95 (2208.54) | 89.24 (2266.66) | 2.29 (58.12) 2.6% |
| Sidewall Height inches (mm) | 3.84 (97.5) | 4.2 (106.75) | 0.36 (9.25) 9.5% |
| Revolutions per mile (km) | 728.69 (452.79) | 710.01 (441.18) | -18.68 (-11.61) -2.6% |
305/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.53 mph (33.03 km/h) |
| 25 mph (40.23 km/h) | 25.66 mph (41.29 km/h) |
| 30 mph (48.28 km/h) | 30.79 mph (49.55 km/h) |
| 35 mph (56.33 km/h) | 35.92 mph (57.81 km/h) |
| 40 mph (64.37 km/h) | 41.05 mph (66.07 km/h) |
| 45 mph (72.42 km/h) | 46.18 mph (74.33 km/h) |
| 50 mph (80.47 km/h) | 51.32 mph (82.58 km/h) |
| 55 mph (88.51 km/h) | 56.45 mph (90.84 km/h) |
| 60 mph (96.56 km/h) | 61.58 mph (99.1 km/h) |
| 65 mph (104.61 km/h) | 66.71 mph (107.36 km/h) |
| 70 mph (112.65 km/h) | 71.84 mph (115.62 km/h) |
| 75 mph (120.7 km/h) | 76.97 mph (123.88 km/h) |
| 80 mph (128.75 km/h) | 82.11 mph (132.14 km/h) |
| 85 mph (136.79 km/h) | 87.24 mph (140.39 km/h) |
| 90 mph (144.84 km/h) | 92.37 mph (148.65 km/h) |
| 95 mph (152.89 km/h) | 97.5 mph (156.91 km/h) |
| 100 mph (160.93 km/h) | 102.63 mph (165.17 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
