Sounds like mose likely the problem you're having is that you've either got to lower the FD down the DT a bit to accommodate the new 26T chainring (never minding what used to be the largest triple chainring) and/or you need a different width BB spindle in order to recenter your chainline between the two new chainrings (i.e., a double).
On Wednesday, September 13, 2017 at 4:59:00 PM UTC-5, lum gim fong wrote: > > Back story: > > Rambouillet. > I recently converted its XD2 triple to an XD2 wide/low by swapping the 36T > middle ring for a 40T and the outer ring for the chainguard that RBW sells. > So now the bike is 26/40 x 11-32 cassette. I am using the same derailers > that worked great when it was a triple. (Deore). Front Derailer – Shimano > XT Triple FD 781X6 Rear Derailer – Shimano Deore. > > > Everything runs great except now when I am in the largest cogs on the > cassette and the inner 24T chainring, the chain rubs the inside of the > front derailer cage no matter how I adjust it. Derailer is straight. Limit > screw adjustments don't help it. > > Seems like the front derailer cage cannot go inboard enough to accommodate > the running of the big cogs on the cassette with the small ring up front. > Even with the shifter cable detached. Used to run fine as a triple. > > So I wonder if I over tightened the crankset when I reinstalled it and > moved it up the spindle a mm or two. That is the only thing I can think > that could be the problem. Making the rings a mm or two closer to the > derailer side of the bike now. I am good about not overdoing things and I > was using a multitool allen to tighten the crankset to the spindle. But > there is no way to tell if I got it a little closer or not I don't think. > > If that is what happened: > > 1. Is that going to be a problem in how the bike feels when I pedal? I > don't know if 1 or 2 mm difference matters or if there is a rule about how > far in the crankset should be set on the spindle. > > 2. Maybe trying a derailer that moves more inboard than the Deore would > solve the chain rub problem? My other bike has a FD cage that sits .5cm > closer to its seat tube than my Deore does on the Rambouillet. That would > give me more clearance. > > Any ideas? > > -- 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 https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
