Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-20 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.22 (793) | 33.02 (838.72) | 1.8 (45.72) 5.8% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) 11.6% |
| Circum. inches (mm) | 98.08 (2491.28) | 103.74 (2634.92) | 5.65 (143.63) 5.8% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 6.51 (165.36) | 0.9 (22.86) 16% |
| Revolutions per mile (km) | 645.99 (401.4) | 610.78 (379.52) | -35.21 (-21.88) -5.5% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.15 mph (34.04 km/h) |
| 25 mph (40.23 km/h) | 26.44 mph (42.55 km/h) |
| 30 mph (48.28 km/h) | 31.73 mph (51.06 km/h) |
| 35 mph (56.33 km/h) | 37.02 mph (59.57 km/h) |
| 40 mph (64.37 km/h) | 42.31 mph (68.09 km/h) |
| 45 mph (72.42 km/h) | 47.59 mph (76.6 km/h) |
| 50 mph (80.47 km/h) | 52.88 mph (85.11 km/h) |
| 55 mph (88.51 km/h) | 58.17 mph (93.62 km/h) |
| 60 mph (96.56 km/h) | 63.46 mph (102.13 km/h) |
| 65 mph (104.61 km/h) | 68.75 mph (110.64 km/h) |
| 70 mph (112.65 km/h) | 74.04 mph (119.15 km/h) |
| 75 mph (120.7 km/h) | 79.32 mph (127.66 km/h) |
| 80 mph (128.75 km/h) | 84.61 mph (136.17 km/h) |
| 85 mph (136.79 km/h) | 89.9 mph (144.68 km/h) |
| 90 mph (144.84 km/h) | 95.19 mph (153.19 km/h) |
| 95 mph (152.89 km/h) | 100.48 mph (161.7 km/h) |
| 100 mph (160.93 km/h) | 105.77 mph (170.21 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1554 | 1806 | 1945 | 2031 | 2123 | 2189 | 2262 | 2348 | 2467 | 2586 | 2718 | 2824 | 3016 | 3228 | 3393 | 3499 | 3558 | 3777 | 4081 | 4742 |
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