Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-20 | 285/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.44 (697) | 27.85 (707.5) | 0.41 (10.5) 1.5% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 86.21 (2189.69) | 87.51 (2222.68) | 1.3 (32.99) 1.5% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 3.93 (99.75) | 0.21 (5.25) 5.6% |
| Revolutions per mile (km) | 734.96 (456.68) | 724.06 (449.91) | -10.91 (-6.78) -1.5% |
285/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.3 mph (32.67 km/h) |
| 25 mph (40.23 km/h) | 25.38 mph (40.84 km/h) |
| 30 mph (48.28 km/h) | 30.45 mph (49.01 km/h) |
| 35 mph (56.33 km/h) | 35.53 mph (57.18 km/h) |
| 40 mph (64.37 km/h) | 40.6 mph (65.34 km/h) |
| 45 mph (72.42 km/h) | 45.68 mph (73.51 km/h) |
| 50 mph (80.47 km/h) | 50.75 mph (81.68 km/h) |
| 55 mph (88.51 km/h) | 55.83 mph (89.85 km/h) |
| 60 mph (96.56 km/h) | 60.9 mph (98.02 km/h) |
| 65 mph (104.61 km/h) | 65.98 mph (106.18 km/h) |
| 70 mph (112.65 km/h) | 71.05 mph (114.35 km/h) |
| 75 mph (120.7 km/h) | 76.13 mph (122.52 km/h) |
| 80 mph (128.75 km/h) | 81.21 mph (130.69 km/h) |
| 85 mph (136.79 km/h) | 86.28 mph (138.86 km/h) |
| 90 mph (144.84 km/h) | 91.36 mph (147.02 km/h) |
| 95 mph (152.89 km/h) | 96.43 mph (155.19 km/h) |
| 100 mph (160.93 km/h) | 101.51 mph (163.36 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1843 | 2141 | 2305 | 2407 | 2517 | 2595 | 2682 | 2783 | 2925 | 3066 | 3223 | 3348 | 3575 | 3826 | 4022 | 4148 | 4218 | 4477 | 4838 | 5622 |
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