Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 285/35-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 25.85 (656.7) | -2.38 (-60.5) -8.4% |
| Width inches (mm) | 12.8 (325) | 11.22 (285) | -1.57 (-40) -12.3% |
| Circum. inches (mm) | 88.71 (2253.15) | 81.22 (2063.08) | -7.48 (-190.07) -8.4% |
| Sidewall Height inches (mm) | 5.12 (130) | 3.93 (99.75) | -1.19 (-30.25) -23.3% |
| Revolutions per mile (km) | 714.26 (443.82) | 780.07 (484.71) | 65.8 (40.89) 9.2% |
285/35-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.31 mph (29.47 km/h) |
| 25 mph (40.23 km/h) | 22.89 mph (36.84 km/h) |
| 30 mph (48.28 km/h) | 27.47 mph (44.21 km/h) |
| 35 mph (56.33 km/h) | 32.05 mph (51.58 km/h) |
| 40 mph (64.37 km/h) | 36.63 mph (58.94 km/h) |
| 45 mph (72.42 km/h) | 41.2 mph (66.31 km/h) |
| 50 mph (80.47 km/h) | 45.78 mph (73.68 km/h) |
| 55 mph (88.51 km/h) | 50.36 mph (81.05 km/h) |
| 60 mph (96.56 km/h) | 54.94 mph (88.42 km/h) |
| 65 mph (104.61 km/h) | 59.52 mph (95.78 km/h) |
| 70 mph (112.65 km/h) | 64.1 mph (103.15 km/h) |
| 75 mph (120.7 km/h) | 68.67 mph (110.52 km/h) |
| 80 mph (128.75 km/h) | 73.25 mph (117.89 km/h) |
| 85 mph (136.79 km/h) | 77.83 mph (125.26 km/h) |
| 90 mph (144.84 km/h) | 82.41 mph (132.62 km/h) |
| 95 mph (152.89 km/h) | 86.99 mph (139.99 km/h) |
| 100 mph (160.93 km/h) | 91.56 mph (147.36 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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