Hi, I don’t really know! They need to work with a 9sp xt cassette and 10sp mech if that’s possible?You after narrow wide or any front ring? What sort of expander do you need as I have a couple of new ones I bought at some point just never got round to using them.
Ha yes, I’ve done some reading, I may need to take an angle grinder to my cassette in order to get an expanded cassette that works properly.. I was think of a 40 or 42t rear if you have one? And a front ring that works with a 9sp chainI'm no expert but thought an expander cog replaced a cog, not added to the count. I'd have thought just adding one would mess up the spacing and add width to the cassette so it wouldn't fit on the freehub?