Originally Posted by
Retro Grouch
I've built up second derailleur wheel sets for several folks so they could swap from knobby tires to slicks without having to make any other adjustments. The keys are rims that are the same width and hubs that position the cassette the same laterally. Chain length, I suppose, could be an issue but it never was in any of the bikes that I outfitted.
I was just thinking if you wanted something like a 11-34 cassette on a knobby-tyred wheel and 11-23 on a slick-tyred wheel you'd have 11 spare links on the latter. I suppose if you've got an RD that can cope with a 34t sprocket it can cope with a 23.
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