Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-18 | 285/35-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 25.85 (656.7) | -0.18 (-4.5) -0.7% |
| Width inches (mm) | 10.04 (255) | 11.22 (285) | 1.18 (30) 11.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 81.22 (2063.08) | -0.56 (-14.14) -0.7% |
| Sidewall Height inches (mm) | 4.02 (102) | 3.93 (99.75) | -0.09 (-2.25) -2.2% |
| Revolutions per mile (km) | 774.76 (481.41) | 780.07 (484.71) | 5.31 (3.3) 0.7% |
285/35-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.86 mph (31.97 km/h) |
| 25 mph (40.23 km/h) | 24.83 mph (39.96 km/h) |
| 30 mph (48.28 km/h) | 29.8 mph (47.95 km/h) |
| 35 mph (56.33 km/h) | 34.76 mph (55.94 km/h) |
| 40 mph (64.37 km/h) | 39.73 mph (63.94 km/h) |
| 45 mph (72.42 km/h) | 44.69 mph (71.93 km/h) |
| 50 mph (80.47 km/h) | 49.66 mph (79.92 km/h) |
| 55 mph (88.51 km/h) | 54.63 mph (87.91 km/h) |
| 60 mph (96.56 km/h) | 59.59 mph (95.9 km/h) |
| 65 mph (104.61 km/h) | 64.56 mph (103.9 km/h) |
| 70 mph (112.65 km/h) | 69.52 mph (111.89 km/h) |
| 75 mph (120.7 km/h) | 74.49 mph (119.88 km/h) |
| 80 mph (128.75 km/h) | 79.46 mph (127.87 km/h) |
| 85 mph (136.79 km/h) | 84.42 mph (135.86 km/h) |
| 90 mph (144.84 km/h) | 89.39 mph (143.86 km/h) |
| 95 mph (152.89 km/h) | 94.35 mph (151.85 km/h) |
| 100 mph (160.93 km/h) | 99.32 mph (159.84 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1985 | 2306 | 2484 | 2593 | 2712 | 2796 | 2889 | 2999 | 3151 | 3303 | 3472 | 3607 | 3852 | 4122 | 4333 | 4469 | 4545 | 4823 | 5212 | 6057 |
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