Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-18 | 275/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.22 (742.2) | 29.91 (759.7) | 0.69 (17.5) 2.4% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 91.8 (2331.69) | 93.96 (2386.67) | 2.16 (54.98) 2.4% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 5.95 (151.25) | 0.34 (8.75) 6.1% |
| Revolutions per mile (km) | 690.2 (428.87) | 674.31 (418.99) | -15.9 (-9.88) -2.3% |
275/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.47 mph (32.95 km/h) |
| 25 mph (40.23 km/h) | 25.59 mph (41.18 km/h) |
| 30 mph (48.28 km/h) | 30.71 mph (49.42 km/h) |
| 35 mph (56.33 km/h) | 35.83 mph (57.66 km/h) |
| 40 mph (64.37 km/h) | 40.94 mph (65.89 km/h) |
| 45 mph (72.42 km/h) | 46.06 mph (74.13 km/h) |
| 50 mph (80.47 km/h) | 51.18 mph (82.36 km/h) |
| 55 mph (88.51 km/h) | 56.3 mph (90.6 km/h) |
| 60 mph (96.56 km/h) | 61.41 mph (98.84 km/h) |
| 65 mph (104.61 km/h) | 66.53 mph (107.07 km/h) |
| 70 mph (112.65 km/h) | 71.65 mph (115.31 km/h) |
| 75 mph (120.7 km/h) | 76.77 mph (123.55 km/h) |
| 80 mph (128.75 km/h) | 81.89 mph (131.78 km/h) |
| 85 mph (136.79 km/h) | 87 mph (140.02 km/h) |
| 90 mph (144.84 km/h) | 92.12 mph (148.26 km/h) |
| 95 mph (152.89 km/h) | 97.24 mph (156.49 km/h) |
| 100 mph (160.93 km/h) | 102.36 mph (164.73 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1716 | 1993 | 2147 | 2242 | 2344 | 2417 | 2497 | 2592 | 2724 | 2855 | 3001 | 3118 | 3330 | 3563 | 3746 | 3863 | 3928 | 4169 | 4505 | 5236 |
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