Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/50-20 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.25 (743) | 29.04 (737.5) | -0.22 (-5.5) -0.7% |
| Width inches (mm) | 9.25 (235) | 10.04 (255) | 0.79 (20) 8.5% |
| Circum. inches (mm) | 91.9 (2334.2) | 91.22 (2316.92) | -0.68 (-17.28) -0.7% |
| Sidewall Height inches (mm) | 4.63 (117.5) | 4.52 (114.75) | -0.11 (-2.75) -2.3% |
| Revolutions per mile (km) | 689.46 (428.41) | 694.6 (431.61) | 5.14 (3.19) 0.7% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.85 mph (31.95 km/h) |
| 25 mph (40.23 km/h) | 24.81 mph (39.94 km/h) |
| 30 mph (48.28 km/h) | 29.78 mph (47.92 km/h) |
| 35 mph (56.33 km/h) | 34.74 mph (55.91 km/h) |
| 40 mph (64.37 km/h) | 39.7 mph (63.9 km/h) |
| 45 mph (72.42 km/h) | 44.67 mph (71.88 km/h) |
| 50 mph (80.47 km/h) | 49.63 mph (79.87 km/h) |
| 55 mph (88.51 km/h) | 54.59 mph (87.86 km/h) |
| 60 mph (96.56 km/h) | 59.56 mph (95.85 km/h) |
| 65 mph (104.61 km/h) | 64.52 mph (103.83 km/h) |
| 70 mph (112.65 km/h) | 69.48 mph (111.82 km/h) |
| 75 mph (120.7 km/h) | 74.44 mph (119.81 km/h) |
| 80 mph (128.75 km/h) | 79.41 mph (127.79 km/h) |
| 85 mph (136.79 km/h) | 84.37 mph (135.78 km/h) |
| 90 mph (144.84 km/h) | 89.33 mph (143.77 km/h) |
| 95 mph (152.89 km/h) | 94.3 mph (151.76 km/h) |
| 100 mph (160.93 km/h) | 99.26 mph (159.74 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
