My belief is that it's wobble, as it is occurring on the stand. I purchased the crank brand-new, straight from Compass, yes. It has less than 300 easy miles on it.
On Thursday, September 13, 2018 at 12:12:46 PM UTC-7, Bill Lindsay wrote: > > Is it wobble or is it flex? Compass claims to QC every one for 'runout' > before shipping. If it is moving 3mm side to side in the workstand, > contact Compass and send it back. My experience with Compass Rene Herse > cranks is they are straight as an arrow. You say 'nearly brand new', does > this mean you bought it second hand? Sending it back to Compass would be > problematic in that case. > > Bill Lindsay > El Cerrito, CA > > On Thursday, September 13, 2018 at 11:44:57 AM UTC-7, 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.
