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I have the Ultegra RX rear derailleur on my Ibis Hakka. I've run it since June so have a fair amount of real world experience with it. It's being run with an XTR 11-40 cassette and I can reasonably say that it will most…
I posted this elsewhere but thought it could be of interest here as well. As a side note, I've been riding this for 3 weeks. I'm in the US, but bought it from a shop in the UK which shipped it to me. Wanted to post…