Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 33/12.5-18 | 285/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.02 (838.8) | 32.59 (827.7) | -0.44 (-11.1) -1.3% |
| Width inches (mm) | 12.52 (318) | 11.22 (285) | -1.3 (-33) -10.4% |
| Circum. inches (mm) | 103.75 (2635.17) | 102.37 (2600.3) | -1.37 (-34.87) -1.3% |
| Sidewall Height inches (mm) | 7.51 (190.8) | 7.29 (185.25) | -0.22 (-5.55) -2.9% |
| Revolutions per mile (km) | 610.72 (379.48) | 618.91 (384.57) | 8.19 (5.09) 1.3% |
285/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.74 mph (31.76 km/h) |
| 25 mph (40.23 km/h) | 24.67 mph (39.7 km/h) |
| 30 mph (48.28 km/h) | 29.6 mph (47.64 km/h) |
| 35 mph (56.33 km/h) | 34.54 mph (55.58 km/h) |
| 40 mph (64.37 km/h) | 39.47 mph (63.52 km/h) |
| 45 mph (72.42 km/h) | 44.4 mph (71.46 km/h) |
| 50 mph (80.47 km/h) | 49.34 mph (79.4 km/h) |
| 55 mph (88.51 km/h) | 54.27 mph (87.34 km/h) |
| 60 mph (96.56 km/h) | 59.21 mph (95.28 km/h) |
| 65 mph (104.61 km/h) | 64.14 mph (103.22 km/h) |
| 70 mph (112.65 km/h) | 69.07 mph (111.16 km/h) |
| 75 mph (120.7 km/h) | 74.01 mph (119.1 km/h) |
| 80 mph (128.75 km/h) | 78.94 mph (127.04 km/h) |
| 85 mph (136.79 km/h) | 83.88 mph (134.98 km/h) |
| 90 mph (144.84 km/h) | 88.81 mph (142.92 km/h) |
| 95 mph (152.89 km/h) | 93.74 mph (150.86 km/h) |
| 100 mph (160.93 km/h) | 98.68 mph (158.81 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1575 | 1830 | 1970 | 2058 | 2151 | 2218 | 2292 | 2379 | 2500 | 2621 | 2755 | 2862 | 3056 | 3271 | 3438 | 3545 | 3606 | 3827 | 4135 | 4805 |
Better Fuel Economy Factory Ratios Increased Power
