BSD's original sprocket has been in production for over 20 years now and shows no signs of stopping anytime soon. Made from fully CNC machined, super-tough 7075-T6 aluminium the Superlite Sprocket is 8mm thick at the edges and tapers down to 6mm at the center to save weight. This makes that tri-spoke design way stronger than it looks. The center bore is 24mm, with 19mm and 22mm adapters included to fit all cranks. ###section### Product Specs TYPE: Bolt On MATERIAL: Alloy WEIGHT: 167.3g (5.9oz) Colour: Black, Polished; Size: 28t, 25t