Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/55-18 | 255/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.18 (715.7) | 28.04 (712.2) | -0.14 (-3.5) -0.5% |
| Width inches (mm) | 9.25 (235) | 10.04 (255) | 0.79 (20) 8.5% |
| Circum. inches (mm) | 88.52 (2248.44) | 88.09 (2237.44) | -0.43 (-11) -0.5% |
| Sidewall Height inches (mm) | 5.09 (129.25) | 5.02 (127.5) | -0.07 (-1.75) -1.4% |
| Revolutions per mile (km) | 715.76 (444.75) | 719.28 (446.94) | 3.52 (2.19) 0.5% |
255/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.9 mph (32.03 km/h) |
| 25 mph (40.23 km/h) | 24.88 mph (40.04 km/h) |
| 30 mph (48.28 km/h) | 29.85 mph (48.04 km/h) |
| 35 mph (56.33 km/h) | 34.83 mph (56.05 km/h) |
| 40 mph (64.37 km/h) | 39.8 mph (64.06 km/h) |
| 45 mph (72.42 km/h) | 44.78 mph (72.07 km/h) |
| 50 mph (80.47 km/h) | 49.76 mph (80.07 km/h) |
| 55 mph (88.51 km/h) | 54.73 mph (88.08 km/h) |
| 60 mph (96.56 km/h) | 59.71 mph (96.09 km/h) |
| 65 mph (104.61 km/h) | 64.68 mph (104.1 km/h) |
| 70 mph (112.65 km/h) | 69.66 mph (112.1 km/h) |
| 75 mph (120.7 km/h) | 74.63 mph (120.11 km/h) |
| 80 mph (128.75 km/h) | 79.61 mph (128.12 km/h) |
| 85 mph (136.79 km/h) | 84.58 mph (136.13 km/h) |
| 90 mph (144.84 km/h) | 89.56 mph (144.13 km/h) |
| 95 mph (152.89 km/h) | 94.54 mph (152.14 km/h) |
| 100 mph (160.93 km/h) | 99.51 mph (160.15 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1830 | 2126 | 2290 | 2391 | 2500 | 2578 | 2664 | 2765 | 2905 | 3046 | 3201 | 3326 | 3552 | 3801 | 3996 | 4120 | 4191 | 4448 | 4806 | 5585 |
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