Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/45-21 | 255/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.39 (771.9) | 30.04 (763) | -0.35 (-8.9) -1.2% |
| Width inches (mm) | 10.43 (265) | 10.04 (255) | -0.39 (-10) -3.8% |
| Circum. inches (mm) | 95.47 (2425) | 94.37 (2397.04) | -1.1 (-27.96) -1.2% |
| Sidewall Height inches (mm) | 4.69 (119.25) | 5.02 (127.5) | 0.32 (8.25) 6.9% |
| Revolutions per mile (km) | 663.65 (412.37) | 671.39 (417.18) | 7.74 (4.81) 1.2% |
255/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.77 mph (31.82 km/h) |
| 25 mph (40.23 km/h) | 24.71 mph (39.77 km/h) |
| 30 mph (48.28 km/h) | 29.65 mph (47.72 km/h) |
| 35 mph (56.33 km/h) | 34.6 mph (55.68 km/h) |
| 40 mph (64.37 km/h) | 39.54 mph (63.63 km/h) |
| 45 mph (72.42 km/h) | 44.48 mph (71.59 km/h) |
| 50 mph (80.47 km/h) | 49.42 mph (79.54 km/h) |
| 55 mph (88.51 km/h) | 54.37 mph (87.49 km/h) |
| 60 mph (96.56 km/h) | 59.31 mph (95.45 km/h) |
| 65 mph (104.61 km/h) | 64.25 mph (103.4 km/h) |
| 70 mph (112.65 km/h) | 69.19 mph (111.36 km/h) |
| 75 mph (120.7 km/h) | 74.14 mph (119.31 km/h) |
| 80 mph (128.75 km/h) | 79.08 mph (127.26 km/h) |
| 85 mph (136.79 km/h) | 84.02 mph (135.22 km/h) |
| 90 mph (144.84 km/h) | 88.96 mph (143.17 km/h) |
| 95 mph (152.89 km/h) | 93.9 mph (151.13 km/h) |
| 100 mph (160.93 km/h) | 98.85 mph (159.08 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1709 | 1985 | 2138 | 2232 | 2334 | 2407 | 2486 | 2581 | 2712 | 2843 | 2988 | 3104 | 3315 | 3548 | 3730 | 3846 | 3912 | 4151 | 4486 | 5213 |
Better Fuel Economy Factory Ratios Increased Power
