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  1. #1
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    shimano LX Derailleur HELP!!!!

    I have a trek 4300 and put on shimano LX Derailleur. The front isn’t working correctly.
    On the middle ring when in either 1st or 2nd gear on the cassette the chain will shift down to the granny. I have had two shops try to adjust it but neither has gotten it fully right. It mostly only happens under tension (up hill).
    Any suggestions on how to adjust this thing correctly?

  2. #2
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    did they check the gears and chain for wear. also the newest shimano front der. need a 50mm chainline to work properly
    www.treefortbikes.com Just lauched V2.0 with free shipping and low prices!

  3. #3
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    chain

    The chain is new also. Can you explain the 50 MM chain line?

  4. #4
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    Instead of having the derailer perfectly paralell to the rings on the front, it's usualy better to have a slight angle with the rear of the derailer toward the bike a bit. Experiment with it a little. You should be able to get all of the cogs on the cassette OK from the middle ring.

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