The Sportster will lower the height of the 3.0 inches (7.5 cm) if it is installed as it is without the aluminum color. Dyna model comes with aluminum color 1 inch long aluminum color and lowers the height of the 2.2 inches (55 mm). There may be differences in the height of the car depending on the model and year, please adjust the aluminum color provided Spring length 41cm diameter 3cm