Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 190/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 26.23 (666.2) | 0.43 (11) 1.7% |
| Width inches (mm) | 7.09 (180) | 7.48 (190) | 0.39 (10) 5.6% |
| Circum. inches (mm) | 81.04 (2058.37) | 82.4 (2092.93) | 1.36 (34.56) 1.7% |
| Sidewall Height inches (mm) | 3.9 (99) | 4.11 (104.5) | 0.22 (5.5) 5.6% |
| Revolutions per mile (km) | 781.85 (485.82) | 768.94 (477.8) | -12.91 (-8.02) -1.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.34 mph (32.73 km/h) |
| 25 mph (40.23 km/h) | 25.42 mph (40.91 km/h) |
| 30 mph (48.28 km/h) | 30.5 mph (49.09 km/h) |
| 35 mph (56.33 km/h) | 35.59 mph (57.27 km/h) |
| 40 mph (64.37 km/h) | 40.67 mph (65.45 km/h) |
| 45 mph (72.42 km/h) | 45.76 mph (73.64 km/h) |
| 50 mph (80.47 km/h) | 50.84 mph (81.82 km/h) |
| 55 mph (88.51 km/h) | 55.92 mph (90 km/h) |
| 60 mph (96.56 km/h) | 61.01 mph (98.18 km/h) |
| 65 mph (104.61 km/h) | 66.09 mph (106.36 km/h) |
| 70 mph (112.65 km/h) | 71.18 mph (114.55 km/h) |
| 75 mph (120.7 km/h) | 76.26 mph (122.73 km/h) |
| 80 mph (128.75 km/h) | 81.34 mph (130.91 km/h) |
| 85 mph (136.79 km/h) | 86.43 mph (139.09 km/h) |
| 90 mph (144.84 km/h) | 91.51 mph (147.27 km/h) |
| 95 mph (152.89 km/h) | 96.59 mph (155.45 km/h) |
| 100 mph (160.93 km/h) | 101.68 mph (163.64 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1957 | 2273 | 2448 | 2556 | 2673 | 2756 | 2848 | 2956 | 3106 | 3256 | 3422 | 3556 | 3797 | 4064 | 4272 | 4405 | 4480 | 4755 | 5138 | 5970 |
Better Fuel Economy Factory Ratios Increased Power
