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    7up's Avatar
    7up Posts: 180, Reputation: 1
    Junior Member
     
    #1

    Apr 8, 2012, 01:07 AM
    Bicycle chain jumping
    What would cause a chain to jump gears on take off and how can it be fixed?
    Curlyben's Avatar
    Curlyben Posts: 18,481, Reputation: 1857
    Admin & Wine Expert
     
    #2

    Apr 8, 2012, 02:45 AM
    Normally this would indicate a tension or location issue.
    What type of bicycle is this ?
    NeedKarma's Avatar
    NeedKarma Posts: 10,635, Reputation: 1706
    Uber Member
     
    #3

    Apr 8, 2012, 04:27 AM
    Or it could be a dérailleur alignment issue. What dérailleur do you have?
    odinn7's Avatar
    odinn7 Posts: 7,691, Reputation: 1547
    Entomology Expert
     
    #4

    Apr 8, 2012, 06:11 AM
    Deraillieur or the chain is stretched and worn... or both.
    ScottGem's Avatar
    ScottGem Posts: 64,966, Reputation: 6056
    Computer Expert and Renaissance Man
     
    #5

    Apr 8, 2012, 07:13 AM
    The first thing to check (and most likely reasons) is a dérailleur adjustment. Especially if you have indexed shifters (that click to change gears). On the dérailleur are tensions srews to adjust the tension of the gear cable. You can play with that adjustment in tiny increments until the shift works smoothly.

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