Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 255/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 28.04 (712.2) | -2.36 (-60) -7.8% |
| Width inches (mm) | 6.89 (175) | 10.04 (255) | 3.15 (80) 45.7% |
| Circum. inches (mm) | 95.51 (2425.94) | 88.09 (2237.44) | -7.42 (-188.5) -7.8% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 5.02 (127.5) | -1.18 (-30) -19% |
| Revolutions per mile (km) | 663.39 (412.21) | 719.28 (446.94) | 55.89 (34.73) 8.4% |
255/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.45 mph (29.69 km/h) |
| 25 mph (40.23 km/h) | 23.06 mph (37.11 km/h) |
| 30 mph (48.28 km/h) | 27.67 mph (44.53 km/h) |
| 35 mph (56.33 km/h) | 32.28 mph (51.95 km/h) |
| 40 mph (64.37 km/h) | 36.89 mph (59.37 km/h) |
| 45 mph (72.42 km/h) | 41.5 mph (66.79 km/h) |
| 50 mph (80.47 km/h) | 46.11 mph (74.22 km/h) |
| 55 mph (88.51 km/h) | 50.73 mph (81.64 km/h) |
| 60 mph (96.56 km/h) | 55.34 mph (89.06 km/h) |
| 65 mph (104.61 km/h) | 59.95 mph (96.48 km/h) |
| 70 mph (112.65 km/h) | 64.56 mph (103.9 km/h) |
| 75 mph (120.7 km/h) | 69.17 mph (111.32 km/h) |
| 80 mph (128.75 km/h) | 73.78 mph (118.74 km/h) |
| 85 mph (136.79 km/h) | 78.4 mph (126.17 km/h) |
| 90 mph (144.84 km/h) | 83.01 mph (133.59 km/h) |
| 95 mph (152.89 km/h) | 87.62 mph (141.01 km/h) |
| 100 mph (160.93 km/h) | 92.23 mph (148.43 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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