Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-20 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.04 (763) | 29.04 (737.5) | -1 (-25.5) -3.3% |
| Width inches (mm) | 10.04 (255) | 10.04 (255) | 0 (0) 0% |
| Circum. inches (mm) | 94.37 (2397.04) | 91.22 (2316.92) | -3.15 (-80.11) -3.3% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 4.52 (114.75) | -0.5 (-12.75) -10% |
| Revolutions per mile (km) | 671.39 (417.18) | 694.6 (431.61) | 23.21 (14.42) 3.5% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.33 mph (31.11 km/h) |
| 25 mph (40.23 km/h) | 24.16 mph (38.89 km/h) |
| 30 mph (48.28 km/h) | 29 mph (46.67 km/h) |
| 35 mph (56.33 km/h) | 33.83 mph (54.44 km/h) |
| 40 mph (64.37 km/h) | 38.66 mph (62.22 km/h) |
| 45 mph (72.42 km/h) | 43.5 mph (70 km/h) |
| 50 mph (80.47 km/h) | 48.33 mph (77.78 km/h) |
| 55 mph (88.51 km/h) | 53.16 mph (85.56 km/h) |
| 60 mph (96.56 km/h) | 57.99 mph (93.33 km/h) |
| 65 mph (104.61 km/h) | 62.83 mph (101.11 km/h) |
| 70 mph (112.65 km/h) | 67.66 mph (108.89 km/h) |
| 75 mph (120.7 km/h) | 72.49 mph (116.67 km/h) |
| 80 mph (128.75 km/h) | 77.33 mph (124.44 km/h) |
| 85 mph (136.79 km/h) | 82.16 mph (132.22 km/h) |
| 90 mph (144.84 km/h) | 86.99 mph (140 km/h) |
| 95 mph (152.89 km/h) | 91.83 mph (147.78 km/h) |
| 100 mph (160.93 km/h) | 96.66 mph (155.56 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 |
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