Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/70-20 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.81 (935) | 33.02 (838.72) | -3.79 (-96.28) -10.3% |
| Width inches (mm) | 12.01 (305) | 12.52 (318) | 0.51 (13) 4.3% |
| Circum. inches (mm) | 115.65 (2937.39) | 103.74 (2634.92) | -11.91 (-302.47) -10.3% |
| Sidewall Height inches (mm) | 8.41 (213.5) | 6.51 (165.36) | -1.9 (-48.14) -22.5% |
| Revolutions per mile (km) | 547.88 (340.44) | 610.78 (379.52) | 62.89 (39.08) 11.5% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.94 mph (28.87 km/h) |
| 25 mph (40.23 km/h) | 22.43 mph (36.09 km/h) |
| 30 mph (48.28 km/h) | 26.91 mph (43.31 km/h) |
| 35 mph (56.33 km/h) | 31.4 mph (50.53 km/h) |
| 40 mph (64.37 km/h) | 35.88 mph (57.75 km/h) |
| 45 mph (72.42 km/h) | 40.37 mph (64.96 km/h) |
| 50 mph (80.47 km/h) | 44.85 mph (72.18 km/h) |
| 55 mph (88.51 km/h) | 49.34 mph (79.4 km/h) |
| 60 mph (96.56 km/h) | 53.82 mph (86.62 km/h) |
| 65 mph (104.61 km/h) | 58.31 mph (93.84 km/h) |
| 70 mph (112.65 km/h) | 62.79 mph (101.05 km/h) |
| 75 mph (120.7 km/h) | 67.28 mph (108.27 km/h) |
| 80 mph (128.75 km/h) | 71.76 mph (115.49 km/h) |
| 85 mph (136.79 km/h) | 76.25 mph (122.71 km/h) |
| 90 mph (144.84 km/h) | 80.73 mph (129.93 km/h) |
| 95 mph (152.89 km/h) | 85.22 mph (137.14 km/h) |
| 100 mph (160.93 km/h) | 89.7 mph (144.36 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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