Renthal Twinring Heavy Duty Rear Sprocket – Blue – 50T 1500-520-50GPBU

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