Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 255/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 28.04 (712.2) | -0.2 (-5) -0.7% |
| Width inches (mm) | 12.8 (325) | 10.04 (255) | -2.76 (-70) -21.5% |
| Circum. inches (mm) | 88.71 (2253.15) | 88.09 (2237.44) | -0.62 (-15.71) -0.7% |
| Sidewall Height inches (mm) | 5.12 (130) | 5.02 (127.5) | -0.1 (-2.5) -1.9% |
| Revolutions per mile (km) | 714.26 (443.82) | 719.28 (446.94) | 5.01 (3.12) 0.7% |
255/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.86 mph (31.96 km/h) |
| 25 mph (40.23 km/h) | 24.83 mph (39.95 km/h) |
| 30 mph (48.28 km/h) | 29.79 mph (47.94 km/h) |
| 35 mph (56.33 km/h) | 34.76 mph (55.93 km/h) |
| 40 mph (64.37 km/h) | 39.72 mph (63.93 km/h) |
| 45 mph (72.42 km/h) | 44.69 mph (71.92 km/h) |
| 50 mph (80.47 km/h) | 49.65 mph (79.91 km/h) |
| 55 mph (88.51 km/h) | 54.62 mph (87.9 km/h) |
| 60 mph (96.56 km/h) | 59.58 mph (95.89 km/h) |
| 65 mph (104.61 km/h) | 64.55 mph (103.88 km/h) |
| 70 mph (112.65 km/h) | 69.51 mph (111.87 km/h) |
| 75 mph (120.7 km/h) | 74.48 mph (119.86 km/h) |
| 80 mph (128.75 km/h) | 79.44 mph (127.85 km/h) |
| 85 mph (136.79 km/h) | 84.41 mph (135.84 km/h) |
| 90 mph (144.84 km/h) | 89.37 mph (143.83 km/h) |
| 95 mph (152.89 km/h) | 94.34 mph (151.82 km/h) |
| 100 mph (160.93 km/h) | 99.3 mph (159.81 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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