Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 33.02 (838.72) | -4.97 (-126.32) -13.1% |
| Width inches (mm) | 15.51 (394) | 12.52 (318) | -2.99 (-76) -19.3% |
| Circum. inches (mm) | 119.36 (3031.76) | 103.74 (2634.92) | -15.62 (-396.85) -13.1% |
| Sidewall Height inches (mm) | 9 (228.52) | 6.51 (165.36) | -2.49 (-63.16) -27.6% |
| Revolutions per mile (km) | 530.83 (329.84) | 610.78 (379.52) | 79.95 (49.68) 15.1% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.38 mph (27.97 km/h) |
| 25 mph (40.23 km/h) | 21.73 mph (34.97 km/h) |
| 30 mph (48.28 km/h) | 26.07 mph (41.96 km/h) |
| 35 mph (56.33 km/h) | 30.42 mph (48.95 km/h) |
| 40 mph (64.37 km/h) | 34.76 mph (55.95 km/h) |
| 45 mph (72.42 km/h) | 39.11 mph (62.94 km/h) |
| 50 mph (80.47 km/h) | 43.46 mph (69.93 km/h) |
| 55 mph (88.51 km/h) | 47.8 mph (76.93 km/h) |
| 60 mph (96.56 km/h) | 52.15 mph (83.92 km/h) |
| 65 mph (104.61 km/h) | 56.49 mph (90.91 km/h) |
| 70 mph (112.65 km/h) | 60.84 mph (97.91 km/h) |
| 75 mph (120.7 km/h) | 65.18 mph (104.9 km/h) |
| 80 mph (128.75 km/h) | 69.53 mph (111.9 km/h) |
| 85 mph (136.79 km/h) | 73.87 mph (118.89 km/h) |
| 90 mph (144.84 km/h) | 78.22 mph (125.88 km/h) |
| 95 mph (152.89 km/h) | 82.56 mph (132.88 km/h) |
| 100 mph (160.93 km/h) | 86.91 mph (139.87 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
