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@Skülly
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OK so I've been abit of a dork. I've gone and got the rings I mentioned above, and realised there's no way my NR deraillieur will have enough length to take up the considerable slack between 42 and 27 rings... duh. Goingbto exchange the granny ring - how much difference can an old short-arm handle: 10 teeth max? Currently using 52/42 and I guess that's my limit. Anyone KNOW, as I guessing here?