Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 240/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 28.39 (721.2) | 2.6 (66) 10.1% |
| Width inches (mm) | 7.09 (180) | 9.45 (240) | 2.36 (60) 33.3% |
| Circum. inches (mm) | 81.04 (2058.37) | 89.2 (2265.72) | 8.16 (207.35) 10.1% |
| Sidewall Height inches (mm) | 3.9 (99) | 5.2 (132) | 1.3 (33) 33.3% |
| Revolutions per mile (km) | 781.85 (485.82) | 710.3 (441.36) | -71.55 (-44.46) -9.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.01 mph (35.43 km/h) |
| 25 mph (40.23 km/h) | 27.52 mph (44.29 km/h) |
| 30 mph (48.28 km/h) | 33.02 mph (53.14 km/h) |
| 35 mph (56.33 km/h) | 38.53 mph (62 km/h) |
| 40 mph (64.37 km/h) | 44.03 mph (70.86 km/h) |
| 45 mph (72.42 km/h) | 49.53 mph (79.72 km/h) |
| 50 mph (80.47 km/h) | 55.04 mph (88.57 km/h) |
| 55 mph (88.51 km/h) | 60.54 mph (97.43 km/h) |
| 60 mph (96.56 km/h) | 66.04 mph (106.29 km/h) |
| 65 mph (104.61 km/h) | 71.55 mph (115.14 km/h) |
| 70 mph (112.65 km/h) | 77.05 mph (124 km/h) |
| 75 mph (120.7 km/h) | 82.55 mph (132.86 km/h) |
| 80 mph (128.75 km/h) | 88.06 mph (141.72 km/h) |
| 85 mph (136.79 km/h) | 93.56 mph (150.57 km/h) |
| 90 mph (144.84 km/h) | 99.07 mph (159.43 km/h) |
| 95 mph (152.89 km/h) | 104.57 mph (168.29 km/h) |
| 100 mph (160.93 km/h) | 110.07 mph (177.15 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1808 | 2100 | 2261 | 2361 | 2469 | 2546 | 2631 | 2731 | 2869 | 3008 | 3161 | 3284 | 3507 | 3754 | 3946 | 4069 | 4138 | 4392 | 4746 | 5515 |
Better Fuel Economy Factory Ratios Increased Power
