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  1. #1
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    Can't screw any nut on 1" threaded fork

    Hi there,
    I can screw anything on this 1" threaded steerer tube. ISO Headsets nuts can crews for 2-3 turns then they oppose too much force feeling like I'm going really to cross threading the tube or the nut (the latter screws on another fork just fine).
    It should be a regular ISO threading 24 threads per inch.... I counted them. Visually I cannot see any imperfection on both sides.
    Any hint? thanks!!

    Can't screw any nut on 1" threaded fork-img_20180613_141516.jpg
    Can't screw any nut on 1" threaded fork-img_20180613_141528.jpg
    Can't screw any nut on 1" threaded fork-img_20180613_142054.jpg

  2. #2
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    Reputation: J.B. Weld's Avatar
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    What kind of bike? There were some weird ones (French?) that had slightly different thread pitches.
    I brake for stinkbugs

  3. #3
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    That's a frame I got from ebay, it has been repainted and there's no hint about where's it has been made, except maybe the BB shell is 70mm then I suppose it is BB Italian threading---
    Sheldon says that "French steerers usually have a flat filed on the back" which is not the case for this steerer which is completely round.

    Can't screw any nut on 1" threaded fork-img_20180612_082103.jpg

  4. #4
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    Could be Italian threads. They had a thread angle of 55 degrees instead of the standard sixty degrees.

  5. #5
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    Interesting...
    From Sheldon: "Obsolete. Threads are cut at 55 degrees, but an ISO or J.I.S. top headset can be used. Fork can be milled to ISO." crown race is 27 + indeed.

    It remains not very clear what he means when he says "ISO or J.I.S. top headset can be used", maybe by forcing beyond manual force, by using a wrench?

  6. #6
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    From Velorange blog :
    "Italian headsets are virtually the same as ISO. The crown race ID is 26.5mm rather than 26.4mm and the threads are a tiny bit different, but ISO headsets are so close that they work absolutely perfectly on Italian frames." ...except mine

  7. #7
    bikes don't have motors
    Reputation: life behind bars's Avatar
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    Chase the threads with an ISO die.
    Quote Originally Posted by me View Post
    Of all the paths you take in life, make sure that most of them are dirt.
    Quote Originally Posted by mack_turtle View Post
    Gravel bike hate is imagined.
    Sweet.

  8. #8
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  9. #9
    bikes don't have motors
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    Quote Originally Posted by Star View Post



    That is a tool holder, it does not include dies.


    This is the die;


    https://www.amazon.com/24-Right-hand.../dp/B008BDIGM2
    Quote Originally Posted by me View Post
    Of all the paths you take in life, make sure that most of them are dirt.
    Quote Originally Posted by mack_turtle View Post
    Gravel bike hate is imagined.
    Sweet.

  10. #10
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    If the threads are a slightly different pitch the ISO die will start ok but will cut into the threads progressively more until it gets back on track again, which wouldn't be good.
    I brake for stinkbugs

  11. #11
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    Got it.

    I am anyway a bit out of luck with this frame. I just cracked the left chainstay while cold setting it to 130. I'm almost sure it's not only the paint that cracked. I will check.

    Too bad, I liked it, I can still hang it to the wall as a decor

    Thanks everybody!

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