When you shift up to the big ring, how close is the derailleur to the ring. You want to get it within 5mm. The other issue may be that the BB is too long. You mentioned having lots of clearance, you probably should have very little clearance. Do you have the option of experimenting with a shorter BB? I had a similar problem on my tandem, w a super record derailleur, and found that a shorter BB & a ring with ramps & pins solved the problem.
Michael On Wednesday, May 23, 2012 2:34:11 PM UTC-4, Leslie wrote: > > Ok, > > One bit of a tuning issue I'm having with the new bike, thought I'd see > what the group suggests... > > Setup: 56 Bombadil 650b frame, 107 SKF BB, with a Sugino XD2 crank > (48/36/24 rings). Rings clear the frame nicely (more clearance than my Ram > has running a DuraAce Octalink triple). > > The front derailleur is a Shimano Deore LX, and I'm using DA 9sp barcons. > The cage on the FD is for a triple, for a 48tooth ring. It has a good > matching arc, and the tail-end of the cage clears the chainstay, no > problems there. > > The problem I'm having is, on the granny ring, and the amount of travel in > shifting (or rather, the zone the derailleur travels when shifting). > > I can center it up on the middle ring, and shift up to the big ring, no > problem, back and forth. But, it's hard to get it to shift all the way > down to the granny. And, it's really easy to overshift on the upshift, > clean past the big ring and take the chain off the front, dropping onto the > crank arm. > > Trying to adjust the tune, cable, set screws, etc., with the derailleur > all the way towards the inside, the cage is just keeping the chain from > easily dropping to the granny. > > I'm half tempted, to try to but a bit of a bend into the cage, to get the > bottom of it to sit closer in towards the seat tube; then, have the shift > lever not bottomed out, but moved further in, before I lock down the cable, > so that when I shift up, it runs out of shifting range before it throws the > chain. > > Does that make sense? > > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To view this discussion on the web visit https://groups.google.com/d/msg/rbw-owners-bunch/-/nR15aOACVeQJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
