For everyone's knowledge: It's a 31.8 clamp size. Ended up using my Microshift $12 derailleur.
Also, 116 link chain is not enough for the stock setup, but it'll do for now. 118 would have been perfect -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.