Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/70-20 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.71 (907) | 33.02 (838.72) | -2.69 (-68.28) -7.5% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) 11.6% |
| Circum. inches (mm) | 112.18 (2849.42) | 103.74 (2634.92) | -8.45 (-214.51) -7.5% |
| Sidewall Height inches (mm) | 7.85 (199.5) | 6.51 (165.36) | -1.34 (-34.14) -17.1% |
| Revolutions per mile (km) | 564.8 (350.95) | 610.78 (379.52) | 45.98 (28.57) 8.1% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.49 mph (29.76 km/h) |
| 25 mph (40.23 km/h) | 23.12 mph (37.2 km/h) |
| 30 mph (48.28 km/h) | 27.74 mph (44.65 km/h) |
| 35 mph (56.33 km/h) | 32.37 mph (52.09 km/h) |
| 40 mph (64.37 km/h) | 36.99 mph (59.53 km/h) |
| 45 mph (72.42 km/h) | 41.61 mph (66.97 km/h) |
| 50 mph (80.47 km/h) | 46.24 mph (74.41 km/h) |
| 55 mph (88.51 km/h) | 50.86 mph (81.85 km/h) |
| 60 mph (96.56 km/h) | 55.48 mph (89.29 km/h) |
| 65 mph (104.61 km/h) | 60.11 mph (96.73 km/h) |
| 70 mph (112.65 km/h) | 64.73 mph (104.17 km/h) |
| 75 mph (120.7 km/h) | 69.35 mph (111.61 km/h) |
| 80 mph (128.75 km/h) | 73.98 mph (119.06 km/h) |
| 85 mph (136.79 km/h) | 78.6 mph (126.5 km/h) |
| 90 mph (144.84 km/h) | 83.22 mph (133.94 km/h) |
| 95 mph (152.89 km/h) | 87.85 mph (141.38 km/h) |
| 100 mph (160.93 km/h) | 92.47 mph (148.82 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 |
Better Fuel Economy Factory Ratios Increased Power
