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@danwentskiing
nope - on YOUR bike. one shop in brum, one in london.
the carrier thing allows you to change your sprockets more easily (ie without splitting a lung leaning on a chainwhip). you screw the 'carrier' on, then the cog slides on its splines. the lockring holds it in place. more important for track riding i guess, but it's s nice feature for less money than shimano cogs.