Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/90-18 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.98 (736.2) | 29.04 (737.5) | 0.05 (1.3) 0.2% |
| Width inches (mm) | 6.1 (155) | 10.04 (255) | 3.94 (100) 64.5% |
| Circum. inches (mm) | 91.06 (2312.84) | 91.22 (2316.92) | 0.16 (4.08) 0.2% |
| Sidewall Height inches (mm) | 5.49 (139.5) | 4.52 (114.75) | -0.97 (-24.75) -17.7% |
| Revolutions per mile (km) | 695.83 (432.37) | 694.6 (431.61) | -1.23 (-0.76) -0.2% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.04 mph (32.24 km/h) |
| 25 mph (40.23 km/h) | 25.04 mph (40.3 km/h) |
| 30 mph (48.28 km/h) | 30.05 mph (48.37 km/h) |
| 35 mph (56.33 km/h) | 35.06 mph (56.43 km/h) |
| 40 mph (64.37 km/h) | 40.07 mph (64.49 km/h) |
| 45 mph (72.42 km/h) | 45.08 mph (72.55 km/h) |
| 50 mph (80.47 km/h) | 50.09 mph (80.61 km/h) |
| 55 mph (88.51 km/h) | 55.1 mph (88.67 km/h) |
| 60 mph (96.56 km/h) | 60.11 mph (96.73 km/h) |
| 65 mph (104.61 km/h) | 65.11 mph (104.79 km/h) |
| 70 mph (112.65 km/h) | 70.12 mph (112.85 km/h) |
| 75 mph (120.7 km/h) | 75.13 mph (120.91 km/h) |
| 80 mph (128.75 km/h) | 80.14 mph (128.98 km/h) |
| 85 mph (136.79 km/h) | 85.15 mph (137.04 km/h) |
| 90 mph (144.84 km/h) | 90.16 mph (145.1 km/h) |
| 95 mph (152.89 km/h) | 95.17 mph (153.16 km/h) |
| 100 mph (160.93 km/h) | 100.18 mph (161.22 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
