Front derailleur adjustment is not rocket science, and unless there is some fundamental incompatibility between derailleur and crankset,* or between derailleur and bottom bracket assembly spindle length*, or between derailleur and shifter*, fixing a shifting problem is simply a matter of proper adjustment, which any competent mechanic ought to be able to accomplish.
The variables are throw (how far out and in the cage moves); height (the cage has to clear the big chainring but not by too much), and angle (the cage has to be aligned fore/aft with respect to the chainrings in such a way as to move the chain on and off the chainrings efficiently; this sometimes means that the cage should be very slightly offset to the chainrings). Can you post photos taken from directly above the front derailleur and showing (1) the cage centered on the big chainring, (2) the cage at maximum outward extension, and (3) the cage furthest inward position? The problem might be that the throw to the outside is inadequate -- ie, that the outer limit screw is screwed down too much; or that the cage is mis-aligned with the chainrings; or it could be that the cable is too loose, tho' your mechanic should have fixed that. * I recall long ago installing a Grafton triple (uber cool at the time) on my 1992 XO-1, but having no clue whatsoever that I needed to replace the 122.5 mm spindle that came with the stock Specialized S-1 crankset with something shorter. The Grafton crank sat way out there on that long spindle, and I unscrewed and unscrewed and unscrewed that outer limit bolt, and still, the front derailleur just *would not* shift to the big ring! So I took it in to a shop, and I still cringe some 25 years later when I recall the contempt in the shop rat's eyes as he explained in simple terms of 1 syllable *that the effing spindle was too effing long!* Patrick Moore, who did redeem himself in his own eyes by getting early Dura Ace 74?? fds to work with a 9-speed-era, external bb Bontrager Race Lite triple (3 gold stars if you correctly explain how). -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/CALuTfgtVEU-fWrXy6nd71gL3bkQb7nFB57N2_u_asxT6a%2BC0Nw%40mail.gmail.com.
