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i've often wondered why shimano ( 9sp) cassettes come the way they do ie the majority are riveted to a carrier leaving 3 loose ( presumably too small to affix ) What really intrigues me is why the 2 smallest have an integral shoulder built in to act as the spacer but the third has a separate loose spacer .Anyone know why this is? ( probably something obvious so can someone please explain to relieve my brain ache)
thanks
Bill
The 3rd one is probably stamped from a sheet of steel (cheap).
The 1st one has to overhang the end of the cassette for the lockring to compress against it, so has to be 1 piece.
My guess would be that the 12t is a common part with the ones used on cassettes ending in 12t? So would have to overhang on those too? And it's cheaper to make one slightly more expensive part than tool up for a second cheaper version.
Either that or the way the chain wraps round means it would touch the larger plastic spacer.
Interesting theory!
Is it in order to precipitate a load of mad bantz on the internet? You krazee muthas!