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  1. #1
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    Old roadbike with stripped one piece crank. Replace 28tpi with 24 tpi crank?

    Hi Bike forums!,

    This is my first post on this marvelous website, and I need help with a roadbike I recently purchased. Its an old nameless roadbike and the pedal holes are completely stripped. I spent an entire afternoon figuring out how to remove the crank, and I found this nice website.

    I wanted to purchase a new crank on ebay, but i realized its a 28 tpi, and those crank are hard to come by. Is it possible to replace the crank with a 24tpi, and get new bearings, cups, and everything else that belongs in the bottom bracket (while still being able to use my crank wheel), or am I stuck having to buy a 28tpi crank from a shady man on the corner?

    Thanks,
    Johnny

    By the way, I'm very very new to bicycle and bicycle repair. This is my first project, and I'm hoping to turn this white rusted POS to a nice road bike. (: Forgive me if I butcher the names of bike parts.

  2. #2
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by tempaznx View Post
    (: Forgive me if I butcher the names of bike parts.
    You've done a heck of a lot better than the usual newbie! Sheldon Brown's site, as usual, provides the answer: http://www.sheldonbrown.com/opc.html . You should be able to replace the crank with an old Schwinn crank and not have an issue or get a 24tpi crank and replace all of the bearings and cones and not have an issue.
    Jeff Wills

    All my bikes.

  3. #3
    Senior Member
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    If you want to replace the crank with a 24TPI crank you will have to replace everything in the bottom bracket area. http://www.sheldonbrown.com/opc.html

  4. #4
    coprolite fietsbob's Avatar
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    One piece cranks can be altered with an adapter ring set to use conventional 3 piece cranksets..

    BMX frames have that done frequently enough to have parts made to do that.

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