Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-20 | 255/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.04 (763) | 29.04 (737.7) | -1 (-25.3) -3.3% |
| Width inches (mm) | 10.04 (255) | 10.04 (255) | 0 (0) 0% |
| Circum. inches (mm) | 94.37 (2397.04) | 91.24 (2317.55) | -3.13 (-79.48) -3.3% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 5.52 (140.25) | 0.5 (12.75) 10% |
| Revolutions per mile (km) | 671.39 (417.18) | 694.42 (431.49) | 23.03 (14.31) 3.4% |
255/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.34 mph (31.12 km/h) |
| 25 mph (40.23 km/h) | 24.17 mph (38.9 km/h) |
| 30 mph (48.28 km/h) | 29.01 mph (46.68 km/h) |
| 35 mph (56.33 km/h) | 33.84 mph (54.46 km/h) |
| 40 mph (64.37 km/h) | 38.67 mph (62.24 km/h) |
| 45 mph (72.42 km/h) | 43.51 mph (70.02 km/h) |
| 50 mph (80.47 km/h) | 48.34 mph (77.8 km/h) |
| 55 mph (88.51 km/h) | 53.18 mph (85.58 km/h) |
| 60 mph (96.56 km/h) | 58.01 mph (93.36 km/h) |
| 65 mph (104.61 km/h) | 62.84 mph (101.14 km/h) |
| 70 mph (112.65 km/h) | 67.68 mph (108.92 km/h) |
| 75 mph (120.7 km/h) | 72.51 mph (116.7 km/h) |
| 80 mph (128.75 km/h) | 77.35 mph (124.48 km/h) |
| 85 mph (136.79 km/h) | 82.18 mph (132.26 km/h) |
| 90 mph (144.84 km/h) | 87.02 mph (140.04 km/h) |
| 95 mph (152.89 km/h) | 91.85 mph (147.82 km/h) |
| 100 mph (160.93 km/h) | 96.68 mph (155.6 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1767 | 2053 | 2211 | 2309 | 2414 | 2489 | 2572 | 2670 | 2805 | 2940 | 3091 | 3211 | 3429 | 3670 | 3858 | 3978 | 4046 | 4294 | 4640 | 5392 |
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