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It'll be wider for a mtb derailleur?
I have got a pretty short bb in the bike so this really might be a problem.
Also the Advent derailleur and other mtb derailleurs I'm finding are looking like they're all 34.9mm clamp and I have a puny 28.6mm seattube.
Might try and pick up a cheapo used mtb derailleur but 1x is looking like an easier option tbh.
M_V-
It could be shimmed. I think most retrogrouch frames are still 68mm BB, so maybe chain line is ok, not sure how much difference the rear spacing makes tbh
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problem solvers makes an adapter for 68 shells/small offset and 28.6 tubes and direct mount FDs.
https://problemsolversbike.com/products/direct-mount-adapter
works with derailleurs like this:
https://cambriabike.com/products/shimano-xt-m786-direct-mount-2x10-front-derailleur
jackbepablo
Eeyorecore
Yeah it is, so I guess chain line could be a problem but I know The Woods use them as a bit of a problem solver