Types of chain and what gearings they'll fit. Shimano gearing Normally will a chain 'do' a selection of cassettes? e.g would a chain for a 8spd fit a 9spd? Reason I'm asking is I've got a selection of bikes, 8 & 9 spd. I've also just got 3 'scrap' bikes. Figured I'd have a go at doing them up a bit and make my mistakes on them. Now these are 7 & 5 spd and could do with new chains. Anyone got 'the knowledge'?