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Can someone remind me why shimano 7 speed is a hassle?
They could only do that if it was. You're rather unlikely to come across UniGlide (used for 6-speed and early 7-speed) unless you deliberately go looking for it. Nearly everything 7-speed you come across will be HyperGlide. You need a spacer to use 7-speed HG cassettes on 8-11 speed HG freehubs, but then you need a spacer on half the 10-speed cassettes too and very few people died.
Can someone remind me why shimano 7 speed is a hassle?
Is it just that 8-10 speed hub cassettes are mix'n match, whereas 7 speed is hyperglide and can only use those cassettes, thus limiting options?
Thanks.