Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/60-18 | 33/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.99 (787.2) | 33.02 (838.8) | 2.03 (51.6) 6.6% |
| Width inches (mm) | 10.83 (275) | 12.52 (318) | 1.69 (43) 15.6% |
| Circum. inches (mm) | 97.36 (2473.06) | 103.75 (2635.17) | 6.38 (162.11) 6.6% |
| Sidewall Height inches (mm) | 6.5 (165) | 7.51 (190.8) | 1.02 (25.8) 15.6% |
| Revolutions per mile (km) | 650.75 (404.36) | 610.72 (379.48) | -40.03 (-24.87) -6.2% |
33/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.31 mph (34.3 km/h) |
| 25 mph (40.23 km/h) | 26.64 mph (42.87 km/h) |
| 30 mph (48.28 km/h) | 31.97 mph (51.45 km/h) |
| 35 mph (56.33 km/h) | 37.29 mph (60.02 km/h) |
| 40 mph (64.37 km/h) | 42.62 mph (68.59 km/h) |
| 45 mph (72.42 km/h) | 47.95 mph (77.17 km/h) |
| 50 mph (80.47 km/h) | 53.28 mph (85.74 km/h) |
| 55 mph (88.51 km/h) | 58.61 mph (94.32 km/h) |
| 60 mph (96.56 km/h) | 63.93 mph (102.89 km/h) |
| 65 mph (104.61 km/h) | 69.26 mph (111.46 km/h) |
| 70 mph (112.65 km/h) | 74.59 mph (120.04 km/h) |
| 75 mph (120.7 km/h) | 79.92 mph (128.61 km/h) |
| 80 mph (128.75 km/h) | 85.24 mph (137.19 km/h) |
| 85 mph (136.79 km/h) | 90.57 mph (145.76 km/h) |
| 90 mph (144.84 km/h) | 95.9 mph (154.34 km/h) |
| 95 mph (152.89 km/h) | 101.23 mph (162.91 km/h) |
| 100 mph (160.93 km/h) | 106.55 mph (171.48 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
