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  1. #1
    Newbie
    Join Date
    Mar 2009
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    Long Island NY
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    2006 Surly Pacer
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    Chain derails going from small to big ring

    Hi all,

    I have a Surly Pacer with the following drive train components:

    Shimano 105 10 speed STI shifters
    Shimano Ultegra front and rear 10 speed dérailleurs
    Shimano Ultegra 9 speed crank set
    Stronglight 9/10 speed compatible chain rings
    shimano 10 speed chain
    Shimano Ultegra 10 speed cassette

    All components are new except for the shifters which I got used.
    The cables and housing are brand new.

    Here is my issue:
    When the bike is in my repair stand it shifts perfectly, but when I use the bike in the trainer or on the road I always have an issue with shifting from little to big ring, sometimes it derails, sometimes it shifts but takes a couple of rotations of the crank to complete the shift. I have the limit screw set so it can't fall to the outside, so it falls off to the inside. I originally had a 9 speed 105 front dérailleur but just changed that to an Ultegra 10 speed front dérailleur in hopes that was the issue, but I still had trouble shifting on my ride this past weekend. I followed the park tool website step by step. Any ideas would be greatly appreciated. Thank you in advance.

  2. #2
    Great State of Varmint Panthers007's Avatar
    Join Date
    Sep 2008
    Location
    Dante's Third Ring
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    Sometimes a visual depiction is better then a written one:

    http://bicycletutor.com/adjust-front-derailer/
    How do you keep an idiot in suspense?

  3. #3
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 5500, Colnago C-50
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    Have you tried adding tension to the cable?
    Was the shifter in its lowest position when the cable was attached?
    Is the derailleur low enough? Or too low? (unlikely)

  4. #4
    Luddite
    Join Date
    Jan 2007
    Location
    Portland, OR
    My Bikes
    Univega Gran Turismo, Cannondale Synapse, Bianchi Aquiletta Folder
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    I had a very similar problem with a Specialized triple crank- when I tried to shift into the middle gear from the granny, it often would skate over the teeth of the middle gear, then drop right off to the inside. A "dog fang" did no good, neither did any adjustment I could do. I changed to some nice Ultegra chainrings, and the problem went away completely. I suggest you might try a new quality matched set of pinned and ramped chainrings. Maybe a buddy has a set you can borrow to test.

  5. #5
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 5500, Colnago C-50
    Posts
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    Squeazel makes a good point. Ramped and pinned Shimano (or similar) chainrings would probably shift better.

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