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chainrub on the big ring -- newbie question(4 posts)

chainrub on the big ring -- newbie questionDrone 5200
May 29, 2003 10:43 AM
I don't know the first thing about bike maintenance. Someone thow me a bone . . .

My relatively 3 month old bike has the standard ultegra triple 52/42/30 and 12-25 cassette. When in the 52-12 combo the outside of the chair rubs against the front derrailer with even the slightest amount of pedaling force applied to the downstroke of the crank on the chain side. There is no rub -- just barely enough clearance -- when spinning the gear with the bike on a stand.

Isn't there a simple screw that needs a quarter turn to let the derrailer go out a bit further? I've been back to the LBS for my free tune-up and they didn't fix it. Is the LBS just being inept or is this the best I can expect from the triple?
re: chainrubChen2
May 29, 2003 3:02 PM
What you have described is not chain rub on the big ring, it's chainrub on the front derailleur, a different problem and easier to fix. You probably need a slight adjustment to the high side limit screw and/or a slight increase in shift cable tension. Have your shop mechanic show you how and read up on the subject. Try your owner's manual, books, web sites, etc.
~Al
re: chainrub on the big ring -- newbie questionalmccm
May 29, 2003 3:33 PM
Here's a good article on adjusting the derailer. It's a fairly simple job.

http://www.sheldonbrown.com/derailer-adjustment.html
thanks guys! I appreciate your advice.dtufts
May 29, 2003 7:12 PM