4Racing CNC Aluminum WSBK Chain Adjsuters Black fits BMW S1000RR 2015-2016 High quality jewelry pieces for your motorcycle made by 4Racing Components of Italy! Allows 100% accurate line up of the left and right side when aligning the rear wheel. Each kit includes 2 chain adjusters, one for left and one for the right side. Also known as WSBK (World Superbike) adjusters. Enables the removal of rear wheels without messing with the chain tension. Same chain adjusters used by Team BMW Motorrad Petronas' S1000RR race bikes.