mysterious case of the loosening spokes

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  • mysterious case of the loosening spokes
  • swisstony
    Member

    I was out last week and after a rocky descent i noticed the tyre was rubbing on the frame, on closer inspection all the spokes had come loose to the extent that the wheel had lost all tension and i had to walk home. So i tightened them all up again but last night the same thing happened, not as bad as i was checking them regularly and i’d remembered my spoke key but they seemed to undo themsleves.

    The thing thats most puzzling is that it isn’t a new build, i did it a few months ago and it’s had plenty of previous outings so why should it start doing it now?

    It’s an 819 on a hope xc hub with the correct length spokes, i’ve checked the hub, rim and eyelets for damage but there doesn’t seem to be any.

    Any advice before i rebuild the whole thing with new spokes and nipples??

    ta

    Premier Icon Onzadog
    Subscriber

    although the wheel may be “true” when you’ve tightened them, this is a classic cass of uneven spoke tension. I little time spent evening out the tensions will sort this problem.

    Premier Icon snowslave
    Subscriber

    Like Onzadog says – I’ve had exactly the same problem recently, and when I fixed it the first time I guess I’d trued the wheel ok but not sorted out the tension. So I was out the next ride and the wheel reverted to banana shape.

    I was on a long ride in the Lakes last a coupld of years ago (sam houghton challenge), with wheels that I’d been using for a few months. I had a flat half way down a massive descent, and after I’d fixed it I noticed that it was rubbing. When I got to the bottom all the spokes were totally loose, like they’d come unscrewed. I never worked out why it happened, it’s never done it since. Bizarre.

    swisstony
    Member

    thanks all, that’s reassuring, back on the gig tonight then

    cheers

    Premier Icon Speshpaul
    Subscriber

    I’d de-tension the rim, check all the nipples and threads, check that the rim doesn’t go a horrible shape with no tension. Then zip it all back together again. Should be fine.

    scruff
    Member

    819s- check the UST nipple/eyelets things are all tight, I had to tighten a few of mine up, it has same effect on spokes as loose nipples.

    I hadto have one 819 rebuilt with new rim as I had flatspotted the rim and the buggerign spokes wouldnt stay tight. I think 819s may be a bugger to get spokes correct once a bit of damage has knocked the rim about a bit.

    swisstony
    Member

    yeh i’ll check the nipple holder things, i did threadlock them when i built it uo but i suppose they could have worked loose, i don’t think the rim is knackered in fact i was very supprised how true it was whan i retensioned it.

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