Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    Junior Member tom d's Avatar
    Join Date
    Apr 2006
    Posts
    24
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Pastic bearing race!

    Just realized I spelled plastic wrong lol sry

    Hi New guy here. Not new to bikes though

    I was changing out my fork on my Specialized crosstrail. When taking off the suspension fork, for the new rigid replacement I found that the race on the factory fork is plastic!
    Needless to say it slipped right off. I'm used to seeing metal ones that need to be worked off and on. I'm not sure if I want to put it back on. Anybody here ever find this and change it to a metal one? Can I get a metal one from anywhere? Or would I cause more problems with the wear on the bearing. This will just be a road driven bike.

    ,I know these major companies have gotton cheaper over the years with parts, but geeeez!

    thanks

    Tom

  2. #2
    Senior Member
    Join Date
    Oct 2007
    Location
    West Yorkshire, United Kingdom
    Posts
    3,419
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    What's the matter with the plastic one if it does the job? if you are trying to change it for a metal one, you will probably end up changing the headset, as crown races are specific to a headset designs.

  3. #3
    Senior Member
    Join Date
    Jul 2005
    Posts
    3,191
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It's probably Delrin or some other high zoot nylon/plastic. I wouldn't worry. bk.

  4. #4
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    21,532
    Mentioned
    51 Post(s)
    Tagged
    1 Thread(s)
    I assume (pardon me if I'm wrong here), that is isn't actually a bearing race, meaning the balls rin on it, but a centering cone that fits to a cartridge bearing. These can be different from the true crown races, you're used to.

    Some centering cones are split, and the taper fit to the lower bearing compresses them onto the fork in a way that the split centering cone works on top. Others might be of plastic and sufficiently compressible that they can tighten without needing a split.

    Either way the acid test is that it's tight enough when the headset is adjusted that there isn't even a hint of play. If you can't get rid of all the play and the fork makes any noise when bounced, or rocked against the brake, then you need to tighten the fit, or use a bearing retainer to keep it stable.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  5. #5
    Junior Member tom d's Avatar
    Join Date
    Apr 2006
    Posts
    24
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks guys all great info! I just never seen plastic down there before. I shall keep it the way is with the new fork.Thanks again guys.

    FB, The actually is no cone on the bottom. The top there is though. I dunno I guess it'll be fine as you thought just a plastic ring , as it has been fine. lol

Posting Permissions

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