Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/50-20 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.01 (813) | 33.02 (838.72) | 1.01 (25.72) 3.2% |
| Width inches (mm) | 12.01 (305) | 12.52 (318) | 0.51 (13) 4.3% |
| Circum. inches (mm) | 100.56 (2554.11) | 103.74 (2634.92) | 3.18 (80.8) 3.2% |
| Sidewall Height inches (mm) | 6 (152.5) | 6.51 (165.36) | 0.51 (12.86) 8.4% |
| Revolutions per mile (km) | 630.1 (391.52) | 610.78 (379.52) | -19.32 (-12.01) -3.1% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.63 mph (33.21 km/h) |
| 25 mph (40.23 km/h) | 25.79 mph (41.51 km/h) |
| 30 mph (48.28 km/h) | 30.95 mph (49.81 km/h) |
| 35 mph (56.33 km/h) | 36.11 mph (58.11 km/h) |
| 40 mph (64.37 km/h) | 41.27 mph (66.41 km/h) |
| 45 mph (72.42 km/h) | 46.42 mph (74.71 km/h) |
| 50 mph (80.47 km/h) | 51.58 mph (83.01 km/h) |
| 55 mph (88.51 km/h) | 56.74 mph (91.31 km/h) |
| 60 mph (96.56 km/h) | 61.9 mph (99.62 km/h) |
| 65 mph (104.61 km/h) | 67.06 mph (107.92 km/h) |
| 70 mph (112.65 km/h) | 72.21 mph (116.22 km/h) |
| 75 mph (120.7 km/h) | 77.37 mph (124.52 km/h) |
| 80 mph (128.75 km/h) | 82.53 mph (132.82 km/h) |
| 85 mph (136.79 km/h) | 87.69 mph (141.12 km/h) |
| 90 mph (144.84 km/h) | 92.85 mph (149.42 km/h) |
| 95 mph (152.89 km/h) | 98.01 mph (157.72 km/h) |
| 100 mph (160.93 km/h) | 103.16 mph (166.03 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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