Single Speed adaptor kit for 8/9 speed Shimano compatible cassette hubsPair of CNC machined aluminium spacers offer lateral support to ‘Deep-tooth’ single sprocketBuilt-in offset optimises chainlineSupplied with 16 and 18T 3/32 cogs and lockring.Note: Cog teeth are 3/32 6/7/8 SpeedNot suitable for narrow 5/64 (9 speed) chains12,13,14,16,18 and 20T cogs also available separatelyIf run with smaller than 14T - must be used with 3/32 inch chain - as 1/8 inch chain will bite into spacers.