RENTHAL TWINRING REAR SPROCKET BLK 50T (1120-520-50GPBK)

Steel and aluminium composite rear chainwheel. Renthal's Twinring chainwheel is the longest lasting most durable chainwheel you can buy - developed over five years of extensive testing. The Renthal Twinring combines a specially enhanced 7075 T6 Aluminium alloy centre and an ultra high strength electroless nickel coated steel outer ring. Combining these two materials creates a chainwheel that is lighter than steel but more durable than the traditional all aluminium chainwheel. The unique flat face design keeps weight to a minimum and prevents fouling on the chain guide.