Renthal Twinring Heavy Duty Rear Sprocket – Black – 50T 1540-520-50GPBK

Unique flat face design keeps weight to a minimum and means the TwinRing is as narrow as a regular chainwheelInner Ring is high strength Ultralight 7075 T6 Aluminum. Outer Ring is Electroless Nickel Coated steelOuter is expanded at 200C and then fitted to