Chainstay length vs tire size
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  1. #1
    Erfahrener Radfahrer
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    Chainstay length vs tire size

    With a chainstay length of 420mm, STA of 73 degrees and BB drop of 75mm, is it possible to run 700x38 tires?

    Are there clearance issues? What would be the minimum chainstay length required to run 38c tires?

    I like short chainstays, and would like to keep as much of the responsiveness of the bike that I can.
    Allan

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  2. #2
    'brifter' is a lame word.
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    Who knows? You're forgetting about some other rather important details.
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  3. #3
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    No, it is not possible.

    Note that most cyclocross bikes have @43cm chainstays, and a 33-34mm tire limit.

    I suppose you could severely flatten the chainstays, but that would reduce lateral stiffness.

  4. #4
    Erfahrener Radfahrer
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    Quote Originally Posted by Peter P. View Post
    No, it is not possible.

    Note that most cyclocross bikes have @43cm chainstays, and a 33-34mm tire limit.

    I suppose you could severely flatten the chainstays, but that would reduce lateral stiffness.
    Thank you, I just purchased rattlecad as well, so that is being helpful. Makes you wonder how companies like Mosaic and Argonaut can run 38c tires on 420mm stays. They must use custom tubes or something.
    Allan

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  5. #5
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    deleted
    Last edited by Jay Strongbow; 3 Weeks Ago at 07:03 AM.

  6. #6
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    Quote Originally Posted by cxwrench View Post
    Who knows? You're forgetting about some other rather important details.
    Some? How about "nearly all" rather important details?

  7. #7
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    Quote Originally Posted by IcemanYVR View Post
    With a chainstay length of 420mm, STA of 73 degrees and BB drop of 75mm, is it possible to run 700x38 tires?

    Are there clearance issues? What would be the minimum chainstay length required to run 38c tires?

    I like short chainstays, and would like to keep as much of the responsiveness of the bike that I can.
    Absolutely, The Trek Checkpoint ALR4 has a 425mm chainstay length and can handle up to 45c tires. The larger sizes have the STA and BB drop you specify.

    https://www.trekbikes.com/us/en_US/b...alr-4/p/22628/

  8. #8
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    [QUOTE=M-theory;5348541]Absolutely, ... you specify.

    Those extra 5mm in the chainstay length are necessary, otherwise 38mm tires aren't going to fit.

    My road bike has 420mm chainstays. It will fit 32mm road tires, but anything larger will hit the back of my 73 degree seat tube.

  9. #9
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    Quote Originally Posted by Peter P. View Post
    My road bike has 420mm chainstays. It will fit 32mm road tires, but anything larger will hit the back of my 73 degree seat tube.
    That is, with your dropout placement. A frame with different dropouts might actually have room.

  10. #10
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    Quote Originally Posted by Kerry Irons View Post
    That is, with your dropout placement. A frame with different dropouts might actually have room.
    You lost me on this. Help me understand how dropout placement factors in to this.

  11. #11
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    Quote Originally Posted by Peter P. View Post
    You lost me on this. Help me understand how dropout placement factors in to this.
    Horizontal vs vertical.

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  12. #12
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    I didn't think anyone built with horizontal dropouts anymore, which is why I didn't consider them.

    But you're right; even some vertical dropout slots angle forward, and if your chainstay length vs. tire size are on the edge, you may have to deflate a tire for installation.

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