Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-17 | 255/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.5 (647.8) | 29.04 (737.7) | 3.54 (89.9) 13.9% |
| Width inches (mm) | 5.31 (135) | 10.04 (255) | 4.72 (120) 88.9% |
| Circum. inches (mm) | 80.12 (2035.12) | 91.24 (2317.55) | 11.12 (282.43) 13.9% |
| Sidewall Height inches (mm) | 4.25 (108) | 5.52 (140.25) | 1.27 (32.25) 29.9% |
| Revolutions per mile (km) | 790.78 (491.37) | 694.42 (431.49) | -96.37 (-59.88) -12.2% |
255/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.78 mph (36.65 km/h) |
| 25 mph (40.23 km/h) | 28.47 mph (45.82 km/h) |
| 30 mph (48.28 km/h) | 34.16 mph (54.98 km/h) |
| 35 mph (56.33 km/h) | 39.86 mph (64.14 km/h) |
| 40 mph (64.37 km/h) | 45.55 mph (73.31 km/h) |
| 45 mph (72.42 km/h) | 51.24 mph (82.47 km/h) |
| 50 mph (80.47 km/h) | 56.94 mph (91.63 km/h) |
| 55 mph (88.51 km/h) | 62.63 mph (100.8 km/h) |
| 60 mph (96.56 km/h) | 68.33 mph (109.96 km/h) |
| 65 mph (104.61 km/h) | 74.02 mph (119.12 km/h) |
| 70 mph (112.65 km/h) | 79.71 mph (128.29 km/h) |
| 75 mph (120.7 km/h) | 85.41 mph (137.45 km/h) |
| 80 mph (128.75 km/h) | 91.1 mph (146.62 km/h) |
| 85 mph (136.79 km/h) | 96.8 mph (155.78 km/h) |
| 90 mph (144.84 km/h) | 102.49 mph (164.94 km/h) |
| 95 mph (152.89 km/h) | 108.18 mph (174.11 km/h) |
| 100 mph (160.93 km/h) | 113.88 mph (183.27 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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