alpha Racing Billet Rear Wheel Spacers BMW S1000RR (2010-2011) with modified design to keep the bushing inside of the rim with less friction. Fits OEM rim, S1000RR -2011, CNC drilled, made from high quality aluminum, black anodized with alpha Racing laser printed logo. 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 billet parts. These special 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.