Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/55-20 | 33/12.5-22 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.21 (843.5) | 33.02 (838.64) | -0.19 (-4.86) -0.6% |
| Width inches (mm) | 12.01 (305) | 12.52 (318) | 0.51 (13) 4.3% |
| Circum. inches (mm) | 104.33 (2649.93) | 103.73 (2634.67) | -0.6 (-15.27) -0.6% |
| Sidewall Height inches (mm) | 6.6 (167.75) | 5.51 (139.92) | -1.1 (-27.83) -16.6% |
| Revolutions per mile (km) | 607.31 (377.37) | 610.83 (379.55) | 3.52 (2.19) 0.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.88 mph (32 km/h) |
| 25 mph (40.23 km/h) | 24.86 mph (40 km/h) |
| 30 mph (48.28 km/h) | 29.83 mph (48 km/h) |
| 35 mph (56.33 km/h) | 34.8 mph (56 km/h) |
| 40 mph (64.37 km/h) | 39.77 mph (64 km/h) |
| 45 mph (72.42 km/h) | 44.74 mph (72 km/h) |
| 50 mph (80.47 km/h) | 49.71 mph (80 km/h) |
| 55 mph (88.51 km/h) | 54.68 mph (88 km/h) |
| 60 mph (96.56 km/h) | 59.65 mph (96 km/h) |
| 65 mph (104.61 km/h) | 64.63 mph (104 km/h) |
| 70 mph (112.65 km/h) | 69.6 mph (112.01 km/h) |
| 75 mph (120.7 km/h) | 74.57 mph (120.01 km/h) |
| 80 mph (128.75 km/h) | 79.54 mph (128.01 km/h) |
| 85 mph (136.79 km/h) | 84.51 mph (136.01 km/h) |
| 90 mph (144.84 km/h) | 89.48 mph (144.01 km/h) |
| 95 mph (152.89 km/h) | 94.45 mph (152.01 km/h) |
| 100 mph (160.93 km/h) | 99.42 mph (160.01 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 | 2719 | 2824 | 3016 | 3228 | 3393 | 3499 | 3559 | 3777 | 4081 | 4743 |
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