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  1. #1
    no one cares -holiday76's Avatar
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    French Threaded Crank

    A while ago I picked up a Stronglight 93. It's a beauty. Well, it was marked as english threaded. I recently put it on a bike.

    It's french threaded.

    hence my ISO posts for french threaded pedals.

    So, I think I can have the threads retapped to english since Frenchy threads are smaller.

    It would exponentially open up my pedal options. Not to mention if I use this bike for a brevet (which I most likely will), I'll probably throw spd's on it. I'd like to be able to do that without changing the beautiful crank out.

    In fact I don't even have a puller for this crank yet.

    So, any opinions on re-tapping? I'm not sure how I feel about modifying an original piece like this, even though it's most definitely the practical answer.

    What would you folks do? It's only original once or just retap it and be done with it?
    Mmmm, bicycles.

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  2. #2
    Senior Member mudboy's Avatar
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    Retap and be done with it. Even better, retap and helicoil, the threads will hold better.
    --~--~--~--~--~--~--~--~--~--~--~--~--~--~--~--~--
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  3. #3
    Senior Member Grand Bois's Avatar
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    All of mine are retapped. Helicoil? Ridiculous!

  4. #4
    Senior Member ColonelJLloyd's Avatar
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    The crank was marked as English threaded or the auction was marked as such?

    I ran into the same issue recently. I was going to tap my 93 but had the same reservations. I began looking for pedals and found a couple pairs of Lyotard rat traps. I really like them with clips and straps. Now I have two French threaded 93s and no real desire to tap them to 9/16" x 20.

    The Stronglight 93 was not a rare crankset by any means so far as I know. If you're a dedicated SPD guy then I don't see an issue having them tapped or you could just continue to look for one that already has English threads.



    Last edited by ColonelJLloyd; 02-17-11 at 07:18 AM.
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  5. #5
    no one cares -holiday76's Avatar
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    Quote Originally Posted by Grand Bois View Post
    All of mine are retapped. Helicoil? Ridiculous!
    i was actually hoping you'd chime in, and I was expecting you to yell at me for considering the retap

    Quote Originally Posted by ColonelJLloyd View Post
    The crank was marked as English threaded or the auction was marked as such?

    I ran into the same issue recently. I was going to tap my 93 but had the same reservations. I began looking for pedals and found a couple pairs of Lyotard rat traps. I really like them with clips and straps. Now I have two French threaded 93s and no real desire to tap them to 9/16" x 20.

    The Stronglight 93 was not a rare crankset by any means so far as I know. If you're a dedicated SPD guy then I don't see an issue having them tapped or you could just continue to look for one that already has English threads.
    the auction was marked as english thread. That, or even more likely I didnt read it entirely and just bid at the last minute...

    I WAS a dedicated spd guy, but I've started riding platforms on some bikes and it's starting to grow on me. That said platforms are ok for a short ride, but I don't think I'll be switching over for longer stuff.

    I guess I'll see about having Curtis at Via retap..it's the last thing keeping me from finishing this bike and I want to ride it!
    Mmmm, bicycles.

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  6. #6
    Senior Member ColonelJLloyd's Avatar
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    Quote Originally Posted by -holiday76 View Post
    I guess I'll see about having Curtis at Via retap..it's the last thing keeping me from finishing this bike and I want to ride it!
    The Carlton? The little 4M adjuster should be delilvered to you today.
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  7. #7
    no one cares -holiday76's Avatar
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    Quote Originally Posted by ColonelJLloyd View Post
    The Carlton? The little 4M adjuster should be delilvered to you today.
    i'm not telling.
    Mmmm, bicycles.

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  8. #8
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    Tap 'em! I bought a set of the Park pedal taps a while back, and they've been invaluable.

    Neal

  9. #9
    Senior Member ColonelJLloyd's Avatar
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    Quote Originally Posted by -holiday76 View Post
    i'm not telling.
    I suppose that's better than telling and NOT showing.
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  10. #10
    no one cares -holiday76's Avatar
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    Quote Originally Posted by ColonelJLloyd View Post
    I suppose that's better than telling and NOT showing.
    soon enough. two more minor details and the pics will be flowin'. I've been trying so hard for the past few months not to show anything until I'm done on the 3 builds I have going on.
    Mmmm, bicycles.

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  11. #11
    no one cares -holiday76's Avatar
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    Quote Originally Posted by nlerner View Post
    Tap 'em! I bought a set of the Park pedal taps a while back, and they've been invaluable.

    Neal
    that would be these right?

    http://www.treefortbikes.com/product...l-Tap-Set.html

    maybe I should just get a set since I'll probably spend half of that having someone else do it.
    Mmmm, bicycles.

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  12. #12
    rhm
    rhm is offline
    multimodal commuter rhm's Avatar
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    You could just see if anyone has a set you can borrow. Come to think of it, I have a set you can borrow. Problem solved.

  13. #13
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    Quote Originally Posted by -holiday76 View Post
    that would be these right?

    http://www.treefortbikes.com/product...l-Tap-Set.html

    maybe I should just get a set since I'll probably spend half of that having someone else do it.
    Yup, those are they. You'll also make your money back with what you save buying eBay cranksets that *are* marked French threaded. They usually go for significantly less than English threaded.

    Neal

  14. #14
    Senior Member ColonelJLloyd's Avatar
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    Quote Originally Posted by nlerner View Post
    Yup, those are they. You'll also make your money back with what you save buying eBay cranksets that *are* marked French threaded. They usually go for significantly less than English threaded.

    Neal
    Shhhh! Shush it!
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  15. #15
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    Quote Originally Posted by ColonelJLloyd View Post
    Shhhh! Shush it!
    It did occur to me that I just gave away a C&V state secret. Well, not anymore.

    Neal

  16. #16
    no one cares -holiday76's Avatar
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    Quote Originally Posted by nlerner View Post
    Yup, those are they. You'll also make your money back with what you save buying eBay cranksets that *are* marked French threaded. They usually go for significantly less than English threaded.

    Neal
    that's probably why I scored the one I have so cheap, come to think of it...
    Mmmm, bicycles.

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  17. #17
    Senior Member Grand Bois's Avatar
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    The T handle for the taps may cost you almost as much as the taps. I used an adjustable wrench to turn the taps until I broke down and bought one. Very little material is removed and the taps go through the aluminum like butter. It's not even necessary to remove the crank from the bike.

  18. #18
    can't member Noah Scape's Avatar
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    Quote Originally Posted by nlerner View Post
    ...you save buying eBay cranksets that *are* marked French threaded. They usually go for significantly less than English threaded.

    Neal
    Conversely, it seems to make French threaded pedals more valuable. I sold some Frenchy threaded Lyotard 45CAs on ebay last summer and got twice what I thought I'd get.

    I've retapped a dozen or so Frenchy threaded cranks... I wouldn't hesitate in recommending it.
    Last edited by Noah Scape; 02-17-11 at 08:50 AM.

  19. #19
    PanGalacticGargleBlaster Zaphod Beeblebrox's Avatar
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    LBS did my LA Cyclotouriste's for 10 bux.

    after seeing how well it worked I bought a Tap and Die set from lowes that included a handle, the taps and the Dies to cut threads on a bolt. Just used em last night to thread a hole for a fender mount. Infinitely useful!
    --Don't Panic.

  20. #20
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    Quote Originally Posted by Grand Bois View Post
    The T handle for the taps may cost you almost as much as the taps. I used an adjustable wrench to turn the taps until I broke down and bought one. Very little material is removed and the taps go through the aluminum like butter. It's not even necessary to remove the crank from the bike.
    I also used to use a small crescent wrench to turn the tap, but then I got a real handle at a used tool/junk store. Very old school and cost $1.

    Neal

  21. #21
    Senior Member randyjawa's Avatar
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    Most bike shops will have a set of taps in the drawer, somewhere. Chances are they will be a great help if you approach them. And, for what it is worth, I too have purchased a set of taps, keeping in mind that you will need the proper taps, both right and left hand thread.

    As for the helicoil idea - not!
    Learn how to find, restore and maintain vintage road bicycles at... MY "TEN SPEEDS"

  22. #22
    Old fart JohnDThompson's Avatar
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    Quote Originally Posted by -holiday76 View Post
    the auction was marked as english thread. That, or even more likely I didnt read it entirely and just bid at the last minute...

    I WAS a dedicated spd guy, but I've started riding platforms on some bikes and it's starting to grow on me. That said platforms are ok for a short ride, but I don't think I'll be switching over for longer stuff.

    I guess I'll see about having Curtis at Via retap..it's the last thing keeping me from finishing this bike and I want to ride it!
    Are the arms marked as English thread? Look on the back of the arms -- French thread will have "14 - 125" and English will have "9/16 - 20"

    If they're marked English, chances are they just need to be chased out. If they're French, you may as well tap them anyway to allow a wider selection of pedals.

  23. #23
    no one cares -holiday76's Avatar
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    thanks rhm for the taps. they worked great! I now can put my carbon fiber spd's on my '68 Carlton. Should look great.
    Mmmm, bicycles.

    I prefer emails to private messages - holiday76@gmail.com

  24. #24
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    I'd like to see a picture of this...


  25. #25
    no one cares -holiday76's Avatar
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    Quote Originally Posted by DRietz View Post
    I'd like to see a picture of this...

    soon, very soon.
    Mmmm, bicycles.

    I prefer emails to private messages - holiday76@gmail.com

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