Follow Compass directions to a T. Ride the first few miles then need to re-tighten the arms to Compass spec. I've found the drive-side arm would loosen, until I finally took it to the LBS where they tightened to Compass spec. It needs to be tightened pretty tight, and if you might need a heavier duty torque wrench to reach it. Didn't come loose after.
On Thursday, September 13, 2018 at 2:44:57 PM UTC-4, Michael Doleman wrote: > > 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.
