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loose stem

  • 19-06-2010 2:34pm
    #1
    wersal gummage
    Registered Users, Registered Users 2 Posts: 1,663 ✭✭✭


    Ok so I changed the stem on the bike earlier.

    It is now a bit loose. I dont know the terms for things so I'm sticking a photo in.

    [IMG][/img]stem.jpg

    Item B used to be down where Items C are. There was four of these little things like spacers, 2x 5mm, 1x10mm and 1x 15 mmm (i'm guessing, didn't measure).

    So when I changed the stem I removed one of the spacers as well. I put everything back together but the stem was loose (loose where items C join the frame).

    So I then put item B back on top of the new stem where it is in the picture. The guy in the shop said I might have to do this depending on my bike. However this hasn't changed things. Its still loose. All the nuts are tightened very well.

    Items C can now me moved around, if that makes sense - like a ring on your finger if you know what i mean ???

    Item A did not come with the new stem, it is the original from the bike.

    Can anyone tell me where I've gone wrong ?????

    Thanks.


Comments

  • #2
    bcmf
    Closed Accounts Posts: 6,679 ✭✭✭bcmf


    loosen the 2 bolts on the stem. then loosen the nut on the top cap....(the one you have marked a). Put a small bit of pressure on the stem and I mean small so it is just enough to stop the spacers underneath the stem from moving.While applying the pressure tighten the stem slowly alternating between top and bottom ie dont tighten 1 fully then the other.Dont overtighten. then slowly and gently tighten the the top cap bolt till its just pinch tight


  • #3
    xz
    Registered Users, Registered Users 2 Posts: 1,178 ✭✭✭xz


    +1 on what bcmf has posted. Heres a video link to give you a hand http://www.ehow.com/video_4975588_adjust-bikes-headset.html


  • #4
    [Deleted User]
    Posts: 1,427 ✭ [Deleted User]


    The new stem might be a fraction smaller in the vertical direction, you might need another spacer. The top cap (item A) needs to be pressing down on the stack of spacers/stem NOT on the steerer tube inside them.


  • #5
    wersal gummage
    Registered Users, Registered Users 2 Posts: 1,663 ✭✭✭wersal gummage


    bcmf wrote: »
    loosen the 2 bolts on the stem. then loosen the nut on the top cap....(the one you have marked a). Put a small bit of pressure on the stem and I mean small so it is just enough to stop the spacers underneath the stem from moving.While applying the pressure tighten the stem slowly alternating between top and bottom ie dont tighten 1 fully then the other.Dont overtighten. then slowly and gently tighten the the top cap bolt till its just pinch tight

    Thank you. I've done that now and it is better but there is still a very small bit of movement :( i've tried it three or four times there.


    Deleted User wrote: »
    The new stem might be a fraction smaller in the vertical direction, you might need another spacer. The top cap (item A) needs to be pressing down on the stack of spacers/stem NOT on the steerer tube inside them.

    yeah it is pressing down on the stem alright, thanks.


  • #6
    lescol
    Registered Users, Registered Users 2 Posts: 648 ✭✭✭lescol


    Loosen stem bolts, tighten top cap bolt until play is removed, retighten stem bolts. Check by pulling front brake and rocking bike forward/backward, repeat with wheel turned to 90 degrees, if there is no play the job is done. The top cap only serves to put the initial pressure on the bearings, after that you could theoretically remove it.


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  • #7
    wersal gummage
    Registered Users, Registered Users 2 Posts: 1,663 ✭✭✭wersal gummage


    lescol wrote: »
    Loosen stem bolts, tighten top cap bolt until play is removed, retighten stem bolts. Check by pulling front brake and rocking bike forward/backward, repeat with wheel turned to 90 degrees, if there is no play the job is done. The top cap only serves to put the initial pressure on the bearings, after that you could theoretically remove it.

    Thank you Sir :D


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