The two-piece Renthal Rear Chainwheel and carrier system Carrier system is a replacement for the OEM Ducati one-piece steel sprocket.Once fitted, the carrier allows you to quickly change your rear sprocket without having to remove the rear wheel, hub, spindle or carrier. The Renthal Rear Chainwheel Carrier is a one-time investment leading to much reduced running costs and maintenance downtime thereafter. The Renthal Carrier accepts Renthal chainwheels of variety of chain pitches and tooth sizes.Machined from billet aluminium, a Renthal Carrier combined with the Renthal Chainwheel is 66% lighter than the Ducati OE steel version. This equates to just over a 0.5kg savings.