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  1. #1
    Junior Member
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    Sep 2004
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    Chain guide won't fit seat post

    My chain falls off when I shift from the 50 to the 36 chain ring. I want to buy a chain guide to prevent this. But none of the three brands will fit the 12cm seat post of my Specialized Roubaix. (The three are Dog Fang, 3rd Eye and the Jump Stop.) Does anyone know of a similar product that will fit onto a 12 cm seat tube?

  2. #2
    Senior Member
    Join Date
    Aug 2006
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    state college, PA
    My Bikes
    xo-1, riv atlantis, witcomb fixie, on-one inbred, bridgestone mb-1 w/ drops, bianchi reparto corse mtn bike, trek 650b'd touring bike
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    you just need to adjust your limit screws and or derailluer cable tension. try turning the inner limit screw ie the one closest to the seat tube, a half a turn tighter. if that doesnt work, try anouther half...

  3. #3
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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    You could buy a larger radiator clamp and replace the one that came with the Third Eye Chain Watcher.

    A agree that the inner limit screw on you front derailleur is not adjusted properly if this is a frequent problem. The Chain watchers are supposed to be emergency items, not routine shift limiters.

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