For my recent Hillborne build, I wanted a super-compact double crank. For which I finally settled on one of the modern Rene Herse iterations available from Compass. Crazy-expensive, but I figured me & my Sam were worth it.
I've had nothing but difficulty getting my front derailleur into proper alignment and adjustment, for the crank. (I'm running an 11-34, 9sp cassette, BTW). There is sufficient "wobble" to the crank to make it impossible to trim the derailleur to a point where there is no chain rub, except in those gear combinations where the chainline is spot-on perfect. Anything outside those settings and there is some rub. The large chainring (a 44t) seems to meander by as much as 3mm. This is a nearly brand-new crank, and has not been put through any sort of punishing trials at this point. I'm using one of the Compass SKF bottom brackets, so everything ought to be perfect. But it's not, and I don't know why. So I need to ask: who else uses one of these cranks, and what is your experience with it? Does it simply flex enough that this level of movement is to be expected? On my previous (2009) Sam, I'd used a Sugino compact crank with outboard BB, and never had any such issue. I consider myself to be a reasonably competent mechanic, but I admit troubleshooting FD and crank issues has sometimes proven problematic for me. I've tried micro-adjustments to the position of the FD, and that doesn't seem to be the fix, at all. (I'm using one of the Shimano Ultegra-level CX derailleurs they make specifically for cranks with small outside chainrings). -- 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.
