AluFlange - protection for the R1200 rear wheel flange
This part protects your OEM aluminum rear wheel flange. If you own a R1200 pre 2007 (when BMW got out the upgraded crack-free flange), you definetly ned this. It's a 135$ part that saves you a 400$ part.
A detailed description and install instructions can be found HERE
What are you using this flange on? Bike model and year please.