Bitubo Shocks for most Harley-Davidson Motorcycles. The WME line of shocks from Bitubo are adjustable for Spring Preload and Rebound Damping. The shocks do not have a resi so installation is straight forward and easy. We stock two different lengths 300mm (11 3/4″) and 330mm (13″) so you can choose the look and ride you want.