Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/65-20 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.59 (878.5) | 33.02 (838.72) | -1.57 (-39.78) -4.5% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) 11.6% |
| Circum. inches (mm) | 108.66 (2759.89) | 103.74 (2634.92) | -4.92 (-124.97) -4.5% |
| Sidewall Height inches (mm) | 7.29 (185.25) | 6.51 (165.36) | -0.78 (-19.89) -10.7% |
| Revolutions per mile (km) | 583.12 (362.33) | 610.78 (379.52) | 27.66 (17.19) 4.7% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.09 mph (30.73 km/h) |
| 25 mph (40.23 km/h) | 23.87 mph (38.41 km/h) |
| 30 mph (48.28 km/h) | 28.64 mph (46.09 km/h) |
| 35 mph (56.33 km/h) | 33.42 mph (53.78 km/h) |
| 40 mph (64.37 km/h) | 38.19 mph (61.46 km/h) |
| 45 mph (72.42 km/h) | 42.96 mph (69.14 km/h) |
| 50 mph (80.47 km/h) | 47.74 mph (76.82 km/h) |
| 55 mph (88.51 km/h) | 52.51 mph (84.51 km/h) |
| 60 mph (96.56 km/h) | 57.28 mph (92.19 km/h) |
| 65 mph (104.61 km/h) | 62.06 mph (99.87 km/h) |
| 70 mph (112.65 km/h) | 66.83 mph (107.55 km/h) |
| 75 mph (120.7 km/h) | 71.6 mph (115.24 km/h) |
| 80 mph (128.75 km/h) | 76.38 mph (122.92 km/h) |
| 85 mph (136.79 km/h) | 81.15 mph (130.6 km/h) |
| 90 mph (144.84 km/h) | 85.92 mph (138.28 km/h) |
| 95 mph (152.89 km/h) | 90.7 mph (145.96 km/h) |
| 100 mph (160.93 km/h) | 95.47 mph (153.65 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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