Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-20 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.66 (728) | 29.04 (737.5) | 0.37 (9.5) 1.3% |
| Width inches (mm) | 10.83 (275) | 10.04 (255) | -0.79 (-20) -7.3% |
| Circum. inches (mm) | 90.04 (2287.08) | 91.22 (2316.92) | 1.18 (29.85) 1.3% |
| Sidewall Height inches (mm) | 4.33 (110) | 4.52 (114.75) | 0.19 (4.75) 4.3% |
| Revolutions per mile (km) | 703.67 (437.24) | 694.6 (431.61) | -9.06 (-5.63) -1.3% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.26 mph (32.61 km/h) |
| 25 mph (40.23 km/h) | 25.33 mph (40.76 km/h) |
| 30 mph (48.28 km/h) | 30.39 mph (48.91 km/h) |
| 35 mph (56.33 km/h) | 35.46 mph (57.06 km/h) |
| 40 mph (64.37 km/h) | 40.52 mph (65.21 km/h) |
| 45 mph (72.42 km/h) | 45.59 mph (73.37 km/h) |
| 50 mph (80.47 km/h) | 50.65 mph (81.52 km/h) |
| 55 mph (88.51 km/h) | 55.72 mph (89.67 km/h) |
| 60 mph (96.56 km/h) | 60.78 mph (97.82 km/h) |
| 65 mph (104.61 km/h) | 65.85 mph (105.97 km/h) |
| 70 mph (112.65 km/h) | 70.91 mph (114.12 km/h) |
| 75 mph (120.7 km/h) | 75.98 mph (122.28 km/h) |
| 80 mph (128.75 km/h) | 81.04 mph (130.43 km/h) |
| 85 mph (136.79 km/h) | 86.11 mph (138.58 km/h) |
| 90 mph (144.84 km/h) | 91.17 mph (146.73 km/h) |
| 95 mph (152.89 km/h) | 96.24 mph (154.88 km/h) |
| 100 mph (160.93 km/h) | 101.3 mph (163.03 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1768 | 2053 | 2211 | 2309 | 2415 | 2490 | 2572 | 2670 | 2806 | 2941 | 3091 | 3212 | 3430 | 3671 | 3859 | 3979 | 4047 | 4295 | 4641 | 5393 |
Better Fuel Economy Factory Ratios Increased Power
