Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/40-18 | 255/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.09 (637.2) | 29.04 (737.7) | 3.96 (100.5) 15.8% |
| Width inches (mm) | 8.86 (225) | 10.04 (255) | 1.18 (30) 13.3% |
| Circum. inches (mm) | 78.81 (2001.82) | 91.24 (2317.55) | 12.43 (315.73) 15.8% |
| Sidewall Height inches (mm) | 3.54 (90) | 5.52 (140.25) | 1.98 (50.25) 55.8% |
| Revolutions per mile (km) | 803.94 (499.54) | 694.42 (431.49) | -109.52 (-68.05) -13.6% |
255/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.15 mph (37.26 km/h) |
| 25 mph (40.23 km/h) | 28.94 mph (46.58 km/h) |
| 30 mph (48.28 km/h) | 34.73 mph (55.9 km/h) |
| 35 mph (56.33 km/h) | 40.52 mph (65.21 km/h) |
| 40 mph (64.37 km/h) | 46.31 mph (74.53 km/h) |
| 45 mph (72.42 km/h) | 52.1 mph (83.84 km/h) |
| 50 mph (80.47 km/h) | 57.89 mph (93.16 km/h) |
| 55 mph (88.51 km/h) | 63.67 mph (102.47 km/h) |
| 60 mph (96.56 km/h) | 69.46 mph (111.79 km/h) |
| 65 mph (104.61 km/h) | 75.25 mph (121.11 km/h) |
| 70 mph (112.65 km/h) | 81.04 mph (130.42 km/h) |
| 75 mph (120.7 km/h) | 86.83 mph (139.74 km/h) |
| 80 mph (128.75 km/h) | 92.62 mph (149.05 km/h) |
| 85 mph (136.79 km/h) | 98.41 mph (158.37 km/h) |
| 90 mph (144.84 km/h) | 104.19 mph (167.69 km/h) |
| 95 mph (152.89 km/h) | 109.98 mph (177 km/h) |
| 100 mph (160.93 km/h) | 115.77 mph (186.32 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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