I've always set up my FD's with the outer cage perfectly parallel with the large ring. And the distance between the bottom of the FD cage and the cog teeth is a 2-3mm I guesstimate.
The only time I have had trouble with the chain going off the large ring is from maladjustment . Some cranks are less than stellar too in that the arms are not perfectly made so that the rings do not rotate perfectly true, as seen from above. I had one XD crank that was like that, and it just took more precise adjustment. Like riding with a screwdriver in hand around the block ! I've never bent a FD cage nor would a recommend it, you just should never need to resort to such a thing on a proper, aligned frame. FWIW, my favorite FD's are the 5500 series 105 doubles and the vintage basic Deore triples. Both do not have the molded/curved and what not on the inner plate,they are flat inner, flat outer. I have a 90's XT FD that drives me nuts with it's silly molded inner plate, as the chain rubs too easy inside. Little tolerance. Flat, basic plates with lots of tolerance is where it's at, for me :) I'm guessing, and everyone is guessing as we cannot be with your bike, that your problem Jim is a combination of adjustments. The frame ST angle is not the issue. I had a Stumpie with a super relaxed ST (70) angle that worked just fine all the time. -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
