Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-30 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.44 (951) | 33.02 (838.72) | -4.42 (-112.28) -11.8% |
| Width inches (mm) | 12.4 (315) | 12.52 (318) | 0.12 (3) 1% |
| Circum. inches (mm) | 117.62 (2987.65) | 103.74 (2634.92) | -13.89 (-352.74) -11.8% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 6.51 (165.36) | 2.79 (70.86) 75% |
| Revolutions per mile (km) | 538.66 (334.71) | 610.78 (379.52) | 72.11 (44.81) 13.4% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.64 mph (28.39 km/h) |
| 25 mph (40.23 km/h) | 22.05 mph (35.48 km/h) |
| 30 mph (48.28 km/h) | 26.46 mph (42.58 km/h) |
| 35 mph (56.33 km/h) | 30.87 mph (49.68 km/h) |
| 40 mph (64.37 km/h) | 35.28 mph (56.77 km/h) |
| 45 mph (72.42 km/h) | 39.69 mph (63.87 km/h) |
| 50 mph (80.47 km/h) | 44.1 mph (70.97 km/h) |
| 55 mph (88.51 km/h) | 48.51 mph (78.06 km/h) |
| 60 mph (96.56 km/h) | 52.92 mph (85.16 km/h) |
| 65 mph (104.61 km/h) | 57.33 mph (92.26 km/h) |
| 70 mph (112.65 km/h) | 61.74 mph (99.35 km/h) |
| 75 mph (120.7 km/h) | 66.15 mph (106.45 km/h) |
| 80 mph (128.75 km/h) | 70.55 mph (113.55 km/h) |
| 85 mph (136.79 km/h) | 74.96 mph (120.64 km/h) |
| 90 mph (144.84 km/h) | 79.37 mph (127.74 km/h) |
| 95 mph (152.89 km/h) | 83.78 mph (134.84 km/h) |
| 100 mph (160.93 km/h) | 88.19 mph (141.93 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
