Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/70-18 | 33/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.81 (884.2) | 33.02 (838.8) | -1.79 (-45.4) -5.1% |
| Width inches (mm) | 12.01 (305) | 12.52 (318) | 0.51 (13) 4.3% |
| Circum. inches (mm) | 109.36 (2777.8) | 103.75 (2635.17) | -5.62 (-142.63) -5.1% |
| Sidewall Height inches (mm) | 8.41 (213.5) | 7.51 (190.8) | -0.89 (-22.7) -10.6% |
| Revolutions per mile (km) | 579.36 (360) | 610.72 (379.48) | 31.36 (19.48) 5.4% |
33/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.97 mph (30.53 km/h) |
| 25 mph (40.23 km/h) | 23.72 mph (38.17 km/h) |
| 30 mph (48.28 km/h) | 28.46 mph (45.8 km/h) |
| 35 mph (56.33 km/h) | 33.2 mph (53.43 km/h) |
| 40 mph (64.37 km/h) | 37.95 mph (61.07 km/h) |
| 45 mph (72.42 km/h) | 42.69 mph (68.7 km/h) |
| 50 mph (80.47 km/h) | 47.43 mph (76.34 km/h) |
| 55 mph (88.51 km/h) | 52.18 mph (83.97 km/h) |
| 60 mph (96.56 km/h) | 56.92 mph (91.6 km/h) |
| 65 mph (104.61 km/h) | 61.66 mph (99.24 km/h) |
| 70 mph (112.65 km/h) | 66.41 mph (106.87 km/h) |
| 75 mph (120.7 km/h) | 71.15 mph (114.5 km/h) |
| 80 mph (128.75 km/h) | 75.89 mph (122.14 km/h) |
| 85 mph (136.79 km/h) | 80.64 mph (129.77 km/h) |
| 90 mph (144.84 km/h) | 85.38 mph (137.4 km/h) |
| 95 mph (152.89 km/h) | 90.12 mph (145.04 km/h) |
| 100 mph (160.93 km/h) | 94.87 mph (152.67 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 | 1805 | 1944 | 2030 | 2123 | 2189 | 2262 | 2348 | 2467 | 2586 | 2718 | 2824 | 3016 | 3227 | 3393 | 3499 | 3558 | 3776 | 4080 | 4742 |
Better Fuel Economy Factory Ratios Increased Power
