Contact Compass and send it back for them to confirm. If you have any doubt whatsoever, send it back with the BB also. They have a run-out station mounted to a work bench. If the tiny three bolt spider is 'off' then the small ring will wobble similarly, but to a lesser degree because it's smaller. If the big ring itself is out, and the spider is perfect, then the small ring should be perfect. Can you tell which it is?
Bill Lindsay El Cerrito, CA On Thursday, September 13, 2018 at 12:25:32 PM UTC-7, Michael Doleman wrote: > Have gone through this already. Did a test ride on which -- indeed -- > there was some loosening, to the point that I needed to shore it up on the > ride itself. After that I removed the crank from the spindle, entirely, and > rotated it one notch forward. From there I used a torque wrench to tighten > to Compass spec., which is where it is now. Still wobbling furiously... > > > On Thursday, September 13, 2018 at 12:18:22 PM UTC-7, phil k wrote: >> >> 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.
