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  1. #1
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    New pedals on old bike

    I have a 78 Free Spirit and the old pedals are beat. It seems the thread size is roughly 7/16"...Is that right?
    '05 Giant Rincon

  2. #2
    me have long head tube TallRider's Avatar
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    My guess is 1/2" threaded pedals. This was common on bikes with one-piece cranks, and you can still get such pedals, often designed for cheap kid's bmx bikes with one-piece cranks.

  3. #3
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    I dunno...I just measured and they seem almost exactly 7/16", definetly smaller than 1/2".
    '05 Giant Rincon

  4. #4
    Senior Member colnagorider's Avatar
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    I had a free sprit back in 1980-1982, pedals were 1/2". Pretty standard sizing.
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  5. #5
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    Quote Originally Posted by colnagorider
    I had a free sprit back in 1980-1982, pedals were 1/2". Pretty standard sizing.
    K. I'll take your word for it then. I was measuring by the end that you can see without removing the pedal anyway, probably not 100% (or even 60%) accurate lol.
    '05 Giant Rincon

  6. #6
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    The "root diameter" of the threads is 1/2". What you are measuring is the distance between the peaks of the threads and that will be less than 1/2". The folks telling you you have 1/2" threaded pedals are right and any bike shop will know what you want if you ask for this size.

    For comparison, better quality cranks have 9/16" threads. I just measured the ID of a good crank that I'm absolutely sure takes 9/16" pedal threads and the measurement was 0.505" or right around 1/2".

  7. #7
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    Quote Originally Posted by HillRider
    The "root diameter" of the threads is 1/2". What you are measuring is the distance between the peaks of the threads and that will be less than 1/2". The folks telling you you have 1/2" threaded pedals are right and any bike shop will know what you want if you ask for this size.

    For comparison, better quality cranks have 9/16" threads. I just measured the ID of a good crank that I'm absolutely sure takes 9/16" pedal threads and the measurement was 0.505" or right around 1/2".
    Thanks for the help! I've found a bunch of cheap pedals on eBay that are 1/2" and would be fine for this. I'm trying to keep this as cheap as possible, and since it's not going to be a race machine or anything, cheap is ok so long as they are better than the beat up/really cheap crap that came on it that are all worn out.
    '05 Giant Rincon

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