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  1. #1
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    UPgrading my Chainrings to 26/39 but chain is loose WTF?

    I purchased a new spider and rings to upgrade my XO drive train from 24/36 to 26/39...I got the med fron Derrailuer that I was told I will need for the larger front ring, but once eveything was put on...It was great till I shifted in to the small front ring and was going thru the shifting cycle and BAM my chain came off when I was on the smaller cogs.....Did I do something wrong? I tried 2 different chain length and one will work but its tight as hell on the big ring combo but perfect on the small ring now......please help?

    XO front 26/39 XX rear Derrailuer 11-36 is what I have on now
    Last edited by allthatflash; 06-24-2013 at 11:00 AM.

  2. #2
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    You shouldn't be using the small rear cogs with the small front. You need to size the chain for the big/big combo.
    Maybe need to adjust the front derailleur limit screws.
    Park Tool Co. ParkTool Blog Front Derailleur Adjustments

  3. #3
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    The chain shift fine in the front...just very loose chain in the back with correct chain size.....to the new teeth upgrade

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