Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-20 | 300/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.61 (752) | 29.45 (748) | -0.16 (-4) -0.5% |
| Width inches (mm) | 12.01 (305) | 11.81 (300) | -0.2 (-5) -1.6% |
| Circum. inches (mm) | 93.01 (2362.48) | 92.52 (2349.91) | -0.49 (-12.57) -0.5% |
| Sidewall Height inches (mm) | 4.8 (122) | 4.72 (120) | -0.08 (-2) -1.6% |
| Revolutions per mile (km) | 681.21 (423.28) | 684.85 (425.55) | 3.64 (2.26) 0.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.89 mph (32.02 km/h) |
| 25 mph (40.23 km/h) | 24.87 mph (40.02 km/h) |
| 30 mph (48.28 km/h) | 29.84 mph (48.02 km/h) |
| 35 mph (56.33 km/h) | 34.81 mph (56.03 km/h) |
| 40 mph (64.37 km/h) | 39.79 mph (64.03 km/h) |
| 45 mph (72.42 km/h) | 44.76 mph (72.04 km/h) |
| 50 mph (80.47 km/h) | 49.73 mph (80.04 km/h) |
| 55 mph (88.51 km/h) | 54.71 mph (88.04 km/h) |
| 60 mph (96.56 km/h) | 59.68 mph (96.05 km/h) |
| 65 mph (104.61 km/h) | 64.65 mph (104.05 km/h) |
| 70 mph (112.65 km/h) | 69.63 mph (112.06 km/h) |
| 75 mph (120.7 km/h) | 74.6 mph (120.06 km/h) |
| 80 mph (128.75 km/h) | 79.57 mph (128.06 km/h) |
| 85 mph (136.79 km/h) | 84.55 mph (136.07 km/h) |
| 90 mph (144.84 km/h) | 89.52 mph (144.07 km/h) |
| 95 mph (152.89 km/h) | 94.49 mph (152.07 km/h) |
| 100 mph (160.93 km/h) | 99.47 mph (160.08 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1743 | 2025 | 2180 | 2277 | 2381 | 2455 | 2536 | 2633 | 2766 | 2900 | 3048 | 3167 | 3382 | 3619 | 3805 | 3923 | 3990 | 4235 | 4576 | 5317 |
Better Fuel Economy Factory Ratios Increased Power
