Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8
  1. #1
    Senior Member
    Join Date
    Dec 2009
    Posts
    3,357
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Headset for frame with ~39.4 mm/~1 9/16" I.D. headtube?

    OK, I have a frame I got cheap, but I can't figure out what size headset to put in it.

    It's not designed for an integrated headset and the inside diameter of the head tube - as measured by a micrometer - is about 39.3 mm (just a bit under 1 9/16").

    What size headset cups would fit? 1 1/8" cups have an outside diameter of 34 mm, 1 1/4" cups are 37 mm, and 1 1/2" cups are 49.6 mm.

    FWIW, I have a 1 1/8" fork I'd like to use on the build - since I already have it.

  2. #2
    Senior Member
    Join Date
    Dec 2005
    Posts
    7,819
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My best guess is that u have to use in there a 1 inch semi integrated headset that is like 41 mm ID in the frame... my other guess is that you have to send that frame to get reamed too.

    Read this meanwhile...

    http://www.canecreek.com/manuals/Hea...ationGuide.pdf

  3. #3
    Senior Member
    Join Date
    Dec 2009
    Posts
    3,357
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    No, it's definitely not an integrated 1" headset or semi-integrated one. I've dealt with those, and this head tube is nothing like that. The ends machined to a specific inside diameter at least 1" to 1 1/4" deep, and the "shelf" that is left is obviously not a bearing surface of any kind - in fact the machining reaches all the way to one of the holes made by either the top or down tube, so there's no way it could support an integrated headset of any type. It's just like a "normal" headset, just a weird size.

    FWIW, the head tube outside diameter is about 45mm. The frame is a GT Legato, if that helps.

  4. #4
    Insane Bicycle Mechanic Jeff Wills's Avatar
    Join Date
    Mar 2008
    Location
    other Vancouver
    Posts
    6,418
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Maybe it's some variation on the onepointfive? See here: http://en.wikipedia.org/wiki/Headset_%28bicycle_part%29


    It looks like reducers were available, but you'll have to hunt them down: http://www.e13components.com/zerosta...ucer_cups.html
    Jeff Wills

    All my bikes.

  5. #5
    Low car diet JiveTurkey's Avatar
    Join Date
    Aug 2007
    Location
    Corvallis, OR, USA
    My Bikes
    2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
    Posts
    2,359
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by slopvehicle View Post
    Not wearing a helmet makes me more aware of my surroundings. I find myself anticipating the hardness of concrete 50 or 100 feet in front of me, it's almost a zen-like connection between my face and the pavement.

  6. #6
    Senior Member Iowegian's Avatar
    Join Date
    Dec 2005
    Location
    Boulder, Colo
    Posts
    1,710
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I thought I might have some reducing spacers that would work but it turns out they would fit a tube ID tube of about 43mm to 44mm (there is a gap in the ring). They fit a generic 1 1/8 headset once installed but the OD doesn't seem to match up to any of the standards you listed. They came off a Giant XTC frame that has since been sold. I don't remember what headset I put in there but I think I got it from Cane Creek. Just another data point FWIW.

  7. #7
    Senior Member
    Join Date
    Dec 2009
    Posts
    3,357
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    OK, a bit of luck, and I ran across a mention of this frame (GT Legato 3.0) having something called an "Intellaset" for a headset. And lo and behold, my frame matches the specs for one "Intellaset" headset produced by FSA.

    The headset seems to be a one-of-a-kind that's no longer made.

    No wonder someone's dumping the frames.

  8. #8
    Senior Member
    Join Date
    Dec 2005
    Posts
    7,819
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Last edited by ultraman6970; 10-26-11 at 06:31 PM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •