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  1. #1
    Senior Member shortshorts's Avatar
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    Upgrading an old road bike's fork to threadless.

    Can you swap out a 1" threaded fork with a 1 1/8" threadless fork?
    I know I'd have to use a different stem and headset, but would the small increase in diameter matter at all? Would it still fit inside the head tube of the frame?

  2. #2
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    it wont fit inside the frame.

    you could upgrade to 1in threadless but there wouldnt be any real benefit unless you planned to get a full carbon fork for the sake of weight savings.

  3. #3
    Born Again Pagan irclean's Avatar
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    FWIW, one of my bikes had a threaded headset labeled "25.4", which I originally assumed mean the headset diameter. It turns out that it instead referred to the stem diameter that would fit into the steerer tube. I was therefore able to swap a 1-1/8" threadless fork & headset for my quill stem, headset, and suspension fork. If in doubt, use Sheldon Brown's quarter method to check stem diameter.

    http://sheldonbrown.com/headsets.html#size
    Gettin' my Fred on.

  4. #4
    Senior Member gaucho777's Avatar
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    Quote Originally Posted by irclean View Post
    FWIW, one of my bikes had a threaded headset labeled "25.4", which I originally assumed mean the headset diameter. It turns out that it instead referred to the stem diameter that would fit into the steerer tube...
    http://sheldonbrown.com/headsets.html#size
    I think it's more likely the "25.4" referred to threading (French), not diameter.
    -Randy

    '72 Cilo Pacer '73 Speedwell Ti '74 Nishiki Competition '74 Peugeot UE-8 '86 Look Bernard Hinault 753 '86 Look KG86 '89 Parkpre Team Road '90ish Parkpre Team MTB

    Avatar photo courtesy of jeffveloart.com, contact: contact: jeffnil8 (at) gmail.com.

  5. #5
    Biking Viking. goatalope's Avatar
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    Won't fit. There are a limited number of threadless 1" forks out there. I believe Ritchey makes a carbon one, which I'd consider an upgrade over a lot of forks. I've only ever seen one full carbon 1" threadless...a colnago. Don't know if anybody makes such a thing any longer.
    Tuesdays I work on my hair helmet.

  6. #6
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    Easton 1in full carbon forks are around. I've got one sitting on the shelf.

  7. #7
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    Nashbar has 1" threaded ( in some lengths) and 1" threadless forks that have alloy crowns and steerers. I bought a threadless one to go on a 91 Paramount (Oversea made). The Paramount had the non-lugged crown on the stock steel fork. I like the looks of the Nasbar fork with the new stem and spacers. The carbon legs have a similar swept look as bikes of that era. Marginal weight difference between the original Paramount fork and the Nashbar carbon/alloy fork. I do like the feel with the new fork, but I like the feel of old steel bikes with any fork.

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