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  1. #1
    nordic crosser mcmahon's Avatar
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    Why does my brand new carbon fork...

    have an obsolete, JIS (27.0) crown?

    I just discovered my new 1" Kinesis carbon (with cro-mo steerer) fork won't fit the standard (26.4) crown race on the headset I wanted to use. So if I want to use this fork with anything other than a (cheap, heavy) JIS headset, I have to have someone (LBS: "Oh no, WE can't do that.") mill the crown from 27.0 to 26.4.

    This isn't a NOS fork... Are some modern (okay, I know 1" isn't entirely modern, but still) forks still being manufactured in the JIS size?? And why?

  2. #2
    It's Bicycle Repairman! Bicycle Repairm's Avatar
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    Well, one approach is to find a machine shop or a buddy that has a lathe, chuck that sucker up and take off the extra diameter to bring it to 26.4.
    I've done it many times with nothing more than a file and a steady hand.
    You mileage may vary.

  3. #3
    Senior Member
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    I'm sure some shop has a 1" steerer mill in their tool box from back in the day of 1" steel forks.

  4. #4
    Low car diet JiveTurkey's Avatar
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    Quote Originally Posted by mcmahon View Post
    have an obsolete, JIS (27.0) crown?

    I just discovered my new 1" Kinesis carbon (with cro-mo steerer) fork won't fit the standard (26.4) crown race on the headset I wanted to use.
    Did you or someone else actually measure the crown race seat?
    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.

  5. #5
    Senior Member Joshua A.C. New's Avatar
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    I've used emory paper and patience to solve this problem, myself.
    Joshua A.C. Newman,
    Passionate lover of construction

  6. #6
    Senior Member
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    Maybe they figure that by using a slightly larger diameter the fork is compatible with JIS and the standard size. I really thought that most LBS's could mill that down for you in two shakes.
    The will to win is nothing without the will to prepare. -Juma Ikangaa

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