Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-18 | 285/35-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.44 (646.2) | 25.85 (656.7) | 0.41 (10.5) 1.6% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 79.93 (2030.1) | 81.22 (2063.08) | 1.3 (32.99) 1.6% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 3.93 (99.75) | 0.21 (5.25) 5.6% |
| Revolutions per mile (km) | 792.74 (492.59) | 780.07 (484.71) | -12.68 (-7.88) -1.6% |
285/35-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.32 mph (32.71 km/h) |
| 25 mph (40.23 km/h) | 25.41 mph (40.89 km/h) |
| 30 mph (48.28 km/h) | 30.49 mph (49.06 km/h) |
| 35 mph (56.33 km/h) | 35.57 mph (57.24 km/h) |
| 40 mph (64.37 km/h) | 40.65 mph (65.42 km/h) |
| 45 mph (72.42 km/h) | 45.73 mph (73.6 km/h) |
| 50 mph (80.47 km/h) | 50.81 mph (81.77 km/h) |
| 55 mph (88.51 km/h) | 55.89 mph (89.95 km/h) |
| 60 mph (96.56 km/h) | 60.97 mph (98.13 km/h) |
| 65 mph (104.61 km/h) | 66.06 mph (106.31 km/h) |
| 70 mph (112.65 km/h) | 71.14 mph (114.48 km/h) |
| 75 mph (120.7 km/h) | 76.22 mph (122.66 km/h) |
| 80 mph (128.75 km/h) | 81.3 mph (130.84 km/h) |
| 85 mph (136.79 km/h) | 86.38 mph (139.02 km/h) |
| 90 mph (144.84 km/h) | 91.46 mph (147.19 km/h) |
| 95 mph (152.89 km/h) | 96.54 mph (155.37 km/h) |
| 100 mph (160.93 km/h) | 101.62 mph (163.55 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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