Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/30-20 | 275/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.31 (643) | 28.66 (728) | 3.35 (85) 13.2% |
| Width inches (mm) | 8.86 (225) | 10.83 (275) | 1.97 (50) 22.2% |
| Circum. inches (mm) | 79.53 (2020.04) | 90.04 (2287.08) | 10.51 (267.04) 13.2% |
| Sidewall Height inches (mm) | 2.66 (67.5) | 4.33 (110) | 1.67 (42.5) 63% |
| Revolutions per mile (km) | 796.69 (495.04) | 703.67 (437.24) | -93.02 (-57.8) -11.7% |
275/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.64 mph (36.44 km/h) |
| 25 mph (40.23 km/h) | 28.3 mph (45.55 km/h) |
| 30 mph (48.28 km/h) | 33.97 mph (54.66 km/h) |
| 35 mph (56.33 km/h) | 39.63 mph (63.77 km/h) |
| 40 mph (64.37 km/h) | 45.29 mph (72.88 km/h) |
| 45 mph (72.42 km/h) | 50.95 mph (81.99 km/h) |
| 50 mph (80.47 km/h) | 56.61 mph (91.1 km/h) |
| 55 mph (88.51 km/h) | 62.27 mph (100.22 km/h) |
| 60 mph (96.56 km/h) | 67.93 mph (109.33 km/h) |
| 65 mph (104.61 km/h) | 73.59 mph (118.44 km/h) |
| 70 mph (112.65 km/h) | 79.25 mph (127.55 km/h) |
| 75 mph (120.7 km/h) | 84.91 mph (136.66 km/h) |
| 80 mph (128.75 km/h) | 90.58 mph (145.77 km/h) |
| 85 mph (136.79 km/h) | 96.24 mph (154.88 km/h) |
| 90 mph (144.84 km/h) | 101.9 mph (163.99 km/h) |
| 95 mph (152.89 km/h) | 107.56 mph (173.1 km/h) |
| 100 mph (160.93 km/h) | 113.22 mph (182.21 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1791 | 2080 | 2240 | 2339 | 2446 | 2522 | 2606 | 2705 | 2842 | 2979 | 3132 | 3254 | 3475 | 3719 | 3909 | 4031 | 4100 | 4351 | 4702 | 5464 |
Better Fuel Economy Factory Ratios Increased Power
