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Scilly.Suffolk
@Rincewind
I fitted an izumi chain with new sprocket and chainring. it always grinded, even after a few hundred miles it carried on, so I went back to a new kmc 510 and forgot about the izumi.
I wouldnt change chains every few months just to make your drivechain last longer. run a drivechain til the chain snaps or theres no teeth left, then replace the lot.
A cog interlaces directly with other cogs. you generally shouldnt even have cogs on your bike.