headtube reducer

Discussion in 'Cycling Equipment' started by ellis, Jan 24, 2006.

  1. ellis

    ellis Guest

    I'm looking to get one of these
    http://store.airbomb.com/ItemDesc.asp?IC=HD7200 to install an 1" mtb fork on
    a 1 1/8" mtb headtube. It says it's "for converting a BMX 1 1/8" headtube
    to a 1" headtube." Is there a difference in size between a mtb 1 1/8"
    headtube and a bmx 1 1/8" headtube? Will this work? TIA
     
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  2. jim beam

    jim beam Guest

    ellis wrote:
    > I'm looking to get one of these
    > http://store.airbomb.com/ItemDesc.asp?IC=HD7200 to install an 1" mtb fork on
    > a 1 1/8" mtb headtube. It says it's "for converting a BMX 1 1/8" headtube
    > to a 1" headtube." Is there a difference in size between a mtb 1 1/8"
    > headtube and a bmx 1 1/8" headtube? Will this work? TIA
    >
    >
    >

    it'll work, but why? sell the 1" for to a retrogrouch that wants it
    [and will overpay] and use the money to buy a fork that fits properly.
    seriously, people pay crazy $'s for beaten up, used 1" mtb forks because
    they have 1" frames that they want to keep using.
     
  3. A Muzi

    A Muzi Guest

    ellis wrote:
    > I'm looking to get one of these
    > http://store.airbomb.com/ItemDesc.asp?IC=HD7200 to install an 1" mtb fork on
    > a 1 1/8" mtb headtube. It says it's "for converting a BMX 1 1/8" headtube
    > to a 1" headtube." Is there a difference in size between a mtb 1 1/8"
    > headtube and a bmx 1 1/8" headtube? Will this work? TIA


    BMX headsets for one inch systems have a 34mm head tube
    bore, same as road and offroad headsets for 1-18 inch systems.

    To use a road or offroad one inch headset with a 30.2 (ISO)
    or 30.0 (JIS) bore in a 34mm frame, a simple aluminum
    sleeve, as you found, is all that's needed.

    --
    Andrew Muzi
    www.yellowjersey.org
    Open every day since 1 April, 1971
     
  4. JeffWills

    JeffWills Guest

    A Muzi wrote:
    > ellis wrote:
    > > I'm looking to get one of these
    > > http://store.airbomb.com/ItemDesc.asp?IC=HD7200 to install an 1" mtb fork on
    > > a 1 1/8" mtb headtube. It says it's "for converting a BMX 1 1/8" headtube
    > > to a 1" headtube." Is there a difference in size between a mtb 1 1/8"
    > > headtube and a bmx 1 1/8" headtube? Will this work? TIA

    >
    > BMX headsets for one inch systems have a 34mm head tube
    > bore, same as road and offroad headsets for 1-18 inch systems.
    >
    > To use a road or offroad one inch headset with a 30.2 (ISO)
    > or 30.0 (JIS) bore in a 34mm frame, a simple aluminum
    > sleeve, as you found, is all that's needed.
    >


    Ummm... Sheldon says the BMX 1" headset fit in a 32.7mm bore:
    http://www.sheldonbrown.com/handsup.html#sizes ,
    so the answer to the Ellis's question is "no". The correct adapter is
    this:
    http://harriscyclery.net/site/page.cfm?PageID=49&SKU=HD9901

    Jeff
     
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