Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/55-20 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.34 (821.5) | 33.02 (838.72) | 0.68 (17.22) 2.1% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) 11.6% |
| Circum. inches (mm) | 101.61 (2580.82) | 103.74 (2634.92) | 2.13 (54.1) 2.1% |
| Sidewall Height inches (mm) | 6.17 (156.75) | 6.51 (165.36) | 0.34 (8.61) 5.5% |
| Revolutions per mile (km) | 623.58 (387.47) | 610.78 (379.52) | -12.8 (-7.96) -2.1% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.42 mph (32.86 km/h) |
| 25 mph (40.23 km/h) | 25.52 mph (41.08 km/h) |
| 30 mph (48.28 km/h) | 30.63 mph (49.29 km/h) |
| 35 mph (56.33 km/h) | 35.73 mph (57.51 km/h) |
| 40 mph (64.37 km/h) | 40.84 mph (65.72 km/h) |
| 45 mph (72.42 km/h) | 45.94 mph (73.94 km/h) |
| 50 mph (80.47 km/h) | 51.05 mph (82.15 km/h) |
| 55 mph (88.51 km/h) | 56.15 mph (90.37 km/h) |
| 60 mph (96.56 km/h) | 61.26 mph (98.58 km/h) |
| 65 mph (104.61 km/h) | 66.36 mph (106.8 km/h) |
| 70 mph (112.65 km/h) | 71.47 mph (115.02 km/h) |
| 75 mph (120.7 km/h) | 76.57 mph (123.23 km/h) |
| 80 mph (128.75 km/h) | 81.68 mph (131.45 km/h) |
| 85 mph (136.79 km/h) | 86.78 mph (139.66 km/h) |
| 90 mph (144.84 km/h) | 91.89 mph (147.88 km/h) |
| 95 mph (152.89 km/h) | 96.99 mph (156.09 km/h) |
| 100 mph (160.93 km/h) | 102.1 mph (164.31 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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