Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/30-21 | 285/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.73 (704.4) | 27.85 (707.5) | 0.12 (3.1) 0.4% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 87.12 (2212.94) | 87.51 (2222.68) | 0.38 (9.74) 0.4% |
| Sidewall Height inches (mm) | 3.37 (85.5) | 3.93 (99.75) | 0.56 (14.25) 16.7% |
| Revolutions per mile (km) | 727.24 (451.89) | 724.06 (449.91) | -3.19 (-1.98) -0.4% |
285/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.09 mph (32.33 km/h) |
| 25 mph (40.23 km/h) | 25.11 mph (40.41 km/h) |
| 30 mph (48.28 km/h) | 30.13 mph (48.49 km/h) |
| 35 mph (56.33 km/h) | 35.15 mph (56.58 km/h) |
| 40 mph (64.37 km/h) | 40.18 mph (64.66 km/h) |
| 45 mph (72.42 km/h) | 45.2 mph (72.74 km/h) |
| 50 mph (80.47 km/h) | 50.22 mph (80.82 km/h) |
| 55 mph (88.51 km/h) | 55.24 mph (88.9 km/h) |
| 60 mph (96.56 km/h) | 60.26 mph (96.99 km/h) |
| 65 mph (104.61 km/h) | 65.29 mph (105.07 km/h) |
| 70 mph (112.65 km/h) | 70.31 mph (113.15 km/h) |
| 75 mph (120.7 km/h) | 75.33 mph (121.23 km/h) |
| 80 mph (128.75 km/h) | 80.35 mph (129.31 km/h) |
| 85 mph (136.79 km/h) | 85.37 mph (137.4 km/h) |
| 90 mph (144.84 km/h) | 90.4 mph (145.48 km/h) |
| 95 mph (152.89 km/h) | 95.42 mph (153.56 km/h) |
| 100 mph (160.93 km/h) | 100.44 mph (161.64 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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