Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/60-18 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.63 (727.2) | 29.04 (737.5) | 0.41 (10.3) 1.4% |
| Width inches (mm) | 8.86 (225) | 10.04 (255) | 1.18 (30) 13.3% |
| Circum. inches (mm) | 89.94 (2284.57) | 91.22 (2316.92) | 1.27 (32.36) 1.4% |
| Sidewall Height inches (mm) | 5.31 (135) | 4.52 (114.75) | -0.8 (-20.25) -15% |
| Revolutions per mile (km) | 704.44 (437.72) | 694.6 (431.61) | -9.84 (-6.11) -1.4% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.28 mph (32.64 km/h) |
| 25 mph (40.23 km/h) | 25.35 mph (40.8 km/h) |
| 30 mph (48.28 km/h) | 30.42 mph (48.96 km/h) |
| 35 mph (56.33 km/h) | 35.5 mph (57.12 km/h) |
| 40 mph (64.37 km/h) | 40.57 mph (65.29 km/h) |
| 45 mph (72.42 km/h) | 45.64 mph (73.45 km/h) |
| 50 mph (80.47 km/h) | 50.71 mph (81.61 km/h) |
| 55 mph (88.51 km/h) | 55.78 mph (89.77 km/h) |
| 60 mph (96.56 km/h) | 60.85 mph (97.93 km/h) |
| 65 mph (104.61 km/h) | 65.92 mph (106.09 km/h) |
| 70 mph (112.65 km/h) | 70.99 mph (114.25 km/h) |
| 75 mph (120.7 km/h) | 76.06 mph (122.41 km/h) |
| 80 mph (128.75 km/h) | 81.13 mph (130.57 km/h) |
| 85 mph (136.79 km/h) | 86.2 mph (138.73 km/h) |
| 90 mph (144.84 km/h) | 91.27 mph (146.89 km/h) |
| 95 mph (152.89 km/h) | 96.35 mph (155.05 km/h) |
| 100 mph (160.93 km/h) | 101.42 mph (163.21 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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
