Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/80-18 | 33/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.32 (897.2) | 33.02 (838.8) | -2.3 (-58.4) -6.5% |
| Width inches (mm) | 10.83 (275) | 12.52 (318) | 1.69 (43) 15.6% |
| Circum. inches (mm) | 110.97 (2818.64) | 103.75 (2635.17) | -7.22 (-183.47) -6.5% |
| Sidewall Height inches (mm) | 8.66 (220) | 7.51 (190.8) | -1.15 (-29.2) -13.3% |
| Revolutions per mile (km) | 570.97 (354.78) | 610.72 (379.48) | 39.75 (24.7) 7% |
33/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.7 mph (30.09 km/h) |
| 25 mph (40.23 km/h) | 23.37 mph (37.61 km/h) |
| 30 mph (48.28 km/h) | 28.05 mph (45.14 km/h) |
| 35 mph (56.33 km/h) | 32.72 mph (52.66 km/h) |
| 40 mph (64.37 km/h) | 37.4 mph (60.18 km/h) |
| 45 mph (72.42 km/h) | 42.07 mph (67.71 km/h) |
| 50 mph (80.47 km/h) | 46.75 mph (75.23 km/h) |
| 55 mph (88.51 km/h) | 51.42 mph (82.75 km/h) |
| 60 mph (96.56 km/h) | 56.09 mph (90.28 km/h) |
| 65 mph (104.61 km/h) | 60.77 mph (97.8 km/h) |
| 70 mph (112.65 km/h) | 65.44 mph (105.32 km/h) |
| 75 mph (120.7 km/h) | 70.12 mph (112.84 km/h) |
| 80 mph (128.75 km/h) | 74.79 mph (120.37 km/h) |
| 85 mph (136.79 km/h) | 79.47 mph (127.89 km/h) |
| 90 mph (144.84 km/h) | 84.14 mph (135.41 km/h) |
| 95 mph (152.89 km/h) | 88.82 mph (142.94 km/h) |
| 100 mph (160.93 km/h) | 93.49 mph (150.46 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
