Fed up of smashing your chain on rails and ledges? Then get yourself a guard sprocket! The BSD Guard Sprocket is built tough from 7075 alloy with a classic, no frills 5-spoke design. An offset design provides better chain alignment with a 24mm center hole supllied with both 19mm and 22mm top hat washers to fit all cranks. ###section### Product Specs TYPE: Bolt On MATERIAL: Alloy WEIGHT: 165g (5.82oz) Colour: Black, Polished, Raw; Size: 27t, 28t, 25t