Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-20 | 305/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.61 (752) | 28.41 (721.5) | -1.2 (-30.5) -4.1% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 93.01 (2362.48) | 89.24 (2266.66) | -3.77 (-95.82) -4.1% |
| Sidewall Height inches (mm) | 4.8 (122) | 4.2 (106.75) | -0.6 (-15.25) -12.5% |
| Revolutions per mile (km) | 681.21 (423.28) | 710.01 (441.18) | 28.8 (17.89) 4.2% |
305/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.19 mph (30.88 km/h) |
| 25 mph (40.23 km/h) | 23.99 mph (38.6 km/h) |
| 30 mph (48.28 km/h) | 28.78 mph (46.32 km/h) |
| 35 mph (56.33 km/h) | 33.58 mph (54.04 km/h) |
| 40 mph (64.37 km/h) | 38.38 mph (61.76 km/h) |
| 45 mph (72.42 km/h) | 43.17 mph (69.48 km/h) |
| 50 mph (80.47 km/h) | 47.97 mph (77.2 km/h) |
| 55 mph (88.51 km/h) | 52.77 mph (84.92 km/h) |
| 60 mph (96.56 km/h) | 57.57 mph (92.64 km/h) |
| 65 mph (104.61 km/h) | 62.36 mph (100.36 km/h) |
| 70 mph (112.65 km/h) | 67.16 mph (108.09 km/h) |
| 75 mph (120.7 km/h) | 71.96 mph (115.81 km/h) |
| 80 mph (128.75 km/h) | 76.76 mph (123.53 km/h) |
| 85 mph (136.79 km/h) | 81.55 mph (131.25 km/h) |
| 90 mph (144.84 km/h) | 86.35 mph (138.97 km/h) |
| 95 mph (152.89 km/h) | 91.15 mph (146.69 km/h) |
| 100 mph (160.93 km/h) | 95.94 mph (154.41 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
