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cannondale prophet2 chain device

jamesi8792jamesi8792 Posts: 3
edited September 2012 in MTB workshop & tech
Morning people this is my first post so be gentle.
i have a cannondale prophet2 (2007) model which has a e type bottom bracket mounted front deralier bottom pull, i want to change this set up so it mounts to the down tube and then fit a double chain device system using 24/34 chian rings (bike has no isg tab mounts on the frame) just not sure on what type to use because of swing arm and frame clearance, hoping somelse has done this mod as the chain keeps jumping off on realy rocky stuff (wales riding).

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