Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/40-20 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.09 (688) | 29.04 (737.5) | 1.95 (49.5) 7.2% |
| Width inches (mm) | 8.86 (225) | 10.04 (255) | 1.18 (30) 13.3% |
| Circum. inches (mm) | 85.1 (2161.42) | 91.22 (2316.92) | 6.12 (155.51) 7.2% |
| Sidewall Height inches (mm) | 3.54 (90) | 4.52 (114.75) | 0.97 (24.75) 27.5% |
| Revolutions per mile (km) | 744.58 (462.66) | 694.6 (431.61) | -49.98 (-31.05) -6.7% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.44 mph (34.5 km/h) |
| 25 mph (40.23 km/h) | 26.8 mph (43.13 km/h) |
| 30 mph (48.28 km/h) | 32.16 mph (51.75 km/h) |
| 35 mph (56.33 km/h) | 37.52 mph (60.38 km/h) |
| 40 mph (64.37 km/h) | 42.88 mph (69.01 km/h) |
| 45 mph (72.42 km/h) | 48.24 mph (77.63 km/h) |
| 50 mph (80.47 km/h) | 53.6 mph (86.26 km/h) |
| 55 mph (88.51 km/h) | 58.96 mph (94.88 km/h) |
| 60 mph (96.56 km/h) | 64.32 mph (103.51 km/h) |
| 65 mph (104.61 km/h) | 69.68 mph (112.13 km/h) |
| 70 mph (112.65 km/h) | 75.04 mph (120.76 km/h) |
| 75 mph (120.7 km/h) | 80.4 mph (129.39 km/h) |
| 80 mph (128.75 km/h) | 85.76 mph (138.01 km/h) |
| 85 mph (136.79 km/h) | 91.12 mph (146.64 km/h) |
| 90 mph (144.84 km/h) | 96.48 mph (155.26 km/h) |
| 95 mph (152.89 km/h) | 101.84 mph (163.89 km/h) |
| 100 mph (160.93 km/h) | 107.19 mph (172.51 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
