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raising a threadless stem

  • 06-12-2009 10:12pm
    #1
    littleknown
    Closed Accounts Posts: 291 ✭✭


    just wondering how safe it is to raise a threadless stem, find current setup a little low and have put another spacer in which raises the stem by about half an inch meaning there is a half inch less steerer tube in the stem, is this ok to do? the stem is a sytace F139 and the forks rockshox reba,

    thanks


Comments

  • #2
    kenmc
    Registered Users, Registered Users 2 Posts: 7,278 ✭✭✭kenmc


    sounds a bit precarious to be honest - i'd be more inclined to either flip the stem or get one with more rise on it. Wouldn't be happy with that amount of distance between top of tube and top of stem; the clamp won't be near as effective.


  • #3
    DirkVoodoo
    Registered Users, Registered Users 2 Posts: 11,505 ✭✭✭✭DirkVoodoo


    Not a good idea.

    A 3mm gap is acceptable and indeed recommended with carbon steerers so that you don't crack the lip. I'm not sure exactly in what way it would fail, but I can't imagine that the clamping of the stem to part of the steerer would provide sufficient force to cope with the stresses.

    Either you will snap the steerer or shear the bolt for the stem, I don't know. There is a reason they are designed the way they are though.


  • #4
    Morgan
    Registered Users, Registered Users 2 Posts: 2,481 ✭✭✭Morgan


    Syntace advise a maximum of 6mm between the top of the steerer and the top of the stem. It's not really worth the risk of doing otherwise - it's a fairly crucial component.


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