Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/45-20 | 305/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.74 (755.5) | 29.61 (752) | -0.14 (-3.5) -0.5% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 93.44 (2373.47) | 93.01 (2362.48) | -0.43 (-11) -0.5% |
| Sidewall Height inches (mm) | 4.87 (123.75) | 4.8 (122) | -0.07 (-1.75) -1.4% |
| Revolutions per mile (km) | 678.05 (421.32) | 681.21 (423.28) | 3.16 (1.96) 0.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.91 mph (32.04 km/h) |
| 25 mph (40.23 km/h) | 24.88 mph (40.05 km/h) |
| 30 mph (48.28 km/h) | 29.86 mph (48.06 km/h) |
| 35 mph (56.33 km/h) | 34.84 mph (56.07 km/h) |
| 40 mph (64.37 km/h) | 39.81 mph (64.08 km/h) |
| 45 mph (72.42 km/h) | 44.79 mph (72.09 km/h) |
| 50 mph (80.47 km/h) | 49.77 mph (80.09 km/h) |
| 55 mph (88.51 km/h) | 54.75 mph (88.1 km/h) |
| 60 mph (96.56 km/h) | 59.72 mph (96.11 km/h) |
| 65 mph (104.61 km/h) | 64.7 mph (104.12 km/h) |
| 70 mph (112.65 km/h) | 69.68 mph (112.13 km/h) |
| 75 mph (120.7 km/h) | 74.65 mph (120.14 km/h) |
| 80 mph (128.75 km/h) | 79.63 mph (128.15 km/h) |
| 85 mph (136.79 km/h) | 84.61 mph (136.16 km/h) |
| 90 mph (144.84 km/h) | 89.58 mph (144.17 km/h) |
| 95 mph (152.89 km/h) | 94.56 mph (152.18 km/h) |
| 100 mph (160.93 km/h) | 99.54 mph (160.19 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1734 | 2014 | 2169 | 2265 | 2368 | 2442 | 2523 | 2619 | 2752 | 2884 | 3032 | 3150 | 3364 | 3600 | 3784 | 3902 | 3969 | 4212 | 4551 | 5289 |
Better Fuel Economy Factory Ratios Increased Power
