Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 155/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 28.98 (736.2) | -1.42 (-36) -4.7% |
| Width inches (mm) | 6.89 (175) | 6.1 (155) | -0.79 (-20) -11.4% |
| Circum. inches (mm) | 95.51 (2425.94) | 91.06 (2312.84) | -4.45 (-113.1) -4.7% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 5.49 (139.5) | -0.71 (-18) -11.4% |
| Revolutions per mile (km) | 663.39 (412.21) | 695.83 (432.37) | 32.44 (20.16) 4.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.07 mph (30.69 km/h) |
| 25 mph (40.23 km/h) | 23.83 mph (38.36 km/h) |
| 30 mph (48.28 km/h) | 28.6 mph (46.03 km/h) |
| 35 mph (56.33 km/h) | 33.37 mph (53.7 km/h) |
| 40 mph (64.37 km/h) | 38.14 mph (61.37 km/h) |
| 45 mph (72.42 km/h) | 42.9 mph (69.04 km/h) |
| 50 mph (80.47 km/h) | 47.67 mph (76.72 km/h) |
| 55 mph (88.51 km/h) | 52.44 mph (84.39 km/h) |
| 60 mph (96.56 km/h) | 57.2 mph (92.06 km/h) |
| 65 mph (104.61 km/h) | 61.97 mph (99.73 km/h) |
| 70 mph (112.65 km/h) | 66.74 mph (107.4 km/h) |
| 75 mph (120.7 km/h) | 71.5 mph (115.07 km/h) |
| 80 mph (128.75 km/h) | 76.27 mph (122.75 km/h) |
| 85 mph (136.79 km/h) | 81.04 mph (130.42 km/h) |
| 90 mph (144.84 km/h) | 85.8 mph (138.09 km/h) |
| 95 mph (152.89 km/h) | 90.57 mph (145.76 km/h) |
| 100 mph (160.93 km/h) | 95.34 mph (153.43 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1771 | 2057 | 2215 | 2313 | 2419 | 2494 | 2577 | 2675 | 2811 | 2946 | 3097 | 3217 | 3436 | 3677 | 3866 | 3986 | 4054 | 4303 | 4649 | 5403 |
Better Fuel Economy Factory Ratios Increased Power
