Could the large ring be slightly out of lateral true? I've had that cause derailleur issues before... in fact I had several instances of lateral run-out until I started greasing the BB spindles before installing cranks. Haven't had the issue since.
Anton On Tuesday, July 22, 2014 12:37:00 PM UTC-4, Jim Bronson wrote: > > The chainline is dead centered on the middle ring - I had the LBS check > that and they performed the check while I was present. The 113 BB is the > one that is recommended by Sugino for the crankset. If I added a spacer > between the middle and big ring, it seems like it would lead to chain > suck. But I am open to the idea. > > I have bar-ends, the front derailer is not indexed. The rear is but I am > not sure how this would make a difference. > > > On Tue, Jul 22, 2014 at 11:27 AM, Will <waller....@gmail.com <javascript:> > > wrote: > >> What's the chain line look like? Maybe you need a spacer (or remove a >> spacer) for the cog-set and also, a different length spindle/BB cartridge. >> I mention adjusting chain line, since you have already worked on derailer >> limits and it may be the chain wheels are slightly out of position for the >> limiters. >> >> Alternatively, you could go to non-indexed shifters. >> >> On Tuesday, July 22, 2014 10:13:40 AM UTC-5, Jim Bronson wrote: >>> >>> I have had my Rivendell for approximately 9 years now. During this time >>> I have continually had problems with overshifting of the front derailer. >>> This has continued through 4 different cranksets, two or three different >>> front derailers, different brands of chains, different casettes, different >>> LBSs tinkering with it and so forth. Not to mention my own tinkering. >>> I've theorized that maybe the seat tube angle on my bike is different than >>> others due to the large size of my bike - 69cm, but I don't really know. >>> >>> I had given up on the problem and just rode the chain back on to the big >>> ring if it came off that way, or stopped and put it back on the granny if >>> it came off that way. >>> >>> I just recently as in last week switched to a Deore SGS derailer, so >>> super long cage. With so much longer of a cage, it pulls the chain back a >>> lot father now when it comes off the big ring and I am afraid of something >>> catastrophic happening like the chain getting tangled up in the spokes. So >>> there is a renewed urgency to do something about it. >>> >>> The current front derailer is a Campy Racing T, which from what I read >>> on the Internet is supposed to be good at shifting compact triples. I am >>> currently running a Sugino XD600 46/36/26 crankset and also using Shimano 9 >>> speed bar ends. If it makes a difference. >>> >>> I read something on the 650B list about bending in the leading tip of >>> the outer plate to prevent overshifting. I really don't want to trash a >>> perfectly good front derailer but I'd be willing to try it if there was a >>> reasonable expectation of it being successful. To quote: >>> >>> "On my last successful Ritchey crank build I used an NOS first >>> generation Shimano deer head with said alignment and the leading tip of the >>> outer plate bent in to better keep the 9spd chain from over shifting when >>> coming back up onto the big ring." >>> >>> Or is there a different derailer model I should be using? I'm open to >>> it. >>> >>> -- >>> Keep the metal side up and the rubber side down! >>> >> -- >> 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-bun...@googlegroups.com <javascript:>. >> To post to this group, send email to rbw-owne...@googlegroups.com >> <javascript:>. >> Visit this group at http://groups.google.com/group/rbw-owners-bunch. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Keep the metal side up and the rubber side down! > -- 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 http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
