alpha Racing Adjustable Rear Shock Upper Eccentrics Kit BMW S1000RR (2010-, 2015-), offset 1.0, 2.0, 3.0, 4.0mm. alpha Racing utilizes state-of-the-art computer automated design and experience in World Superbike Championship and brings you the very best in BMW S1000RR/HP4 eccentric kits. These parts are high speed CNC machined, completely milled from high-strength aerospace grade billet aluminum and hard anodized for superior finish, ultra-lightweight and extreme durability.