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  1. #1
    bluebikefixer
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    Where are frame geometry angels taken from?

    Hello everyone,

    Newly minted member here.

    Just wondering where the angle measurements are taken from when describing frame geometry. Example: A 75 degree head tube. It can't be the angle on the inside of the tt and ht because its obtuse. Is the angle measured by imagining the tt passing through the head tube and measuring the angle on the other side? ie: the supplementary angle to the obtuse angle?

    Thanks

  2. #2
    Banned
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    most bike manufacturers have a diagram with the geometry specs they list.
    Last edited by dutret; 03-21-07 at 02:30 PM.

  3. #3
    antisocialite dirtyphotons's Avatar
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    75 degrees between the headtube and horizontal
    Quote Originally Posted by Sheldon Brown
    Because when fashion conflicts with function, I vote for function.

  4. #4
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    uhhhhh yeah what was I thinking

  5. #5
    Gone, but not forgotten Shiznaz's Avatar
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    heaven of course!

  6. #6
    bluebikefixer
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    Thats what I figured, thanks.

  7. #7
    Walks with a limp dijos's Avatar
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    Quote Originally Posted by Shiznaz
    heaven of course!
    nice catch.
    I am looking for a 52cm-ish lugged mixte or ladies frame. Pm if you got one.
    Quote Originally Posted by thebristolkid
    Last I checked, most college campuses were firmly attached to solid earth, which, in my experience, is typically adequate for riding a bicycle upon.

  8. #8
    Strange As Angels Fixxxie's Avatar
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    Quote Originally Posted by Shiznaz
    heaven of course!

    Or Hell, depending on what kind of angels we're talking about
    Quote Originally Posted by sefb222 View Post
    a good reason to form a demolition derby, for fixed gear bikes and the fools who love them.

  9. #9
    Senior Member eddiebrannan's Avatar
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    Quote Originally Posted by cycliques
    Hello everyone,

    Newly minted member here.

    Just wondering where the angle measurements are taken from when describing frame geometry. Example: A 75 degree head tube. It can't be the angle on the inside of the tt and ht because its obtuse. Is the angle measured by imagining the tt passing through the head tube and measuring the angle on the other side? ie: the supplementary angle to the obtuse angle?

    Thanks

    can you really not figure this out all by yourself?

  10. #10
    Dismount Run Remount etc. 12XU's Avatar
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    Quote Originally Posted by eddiebrannan
    can you really not figure this out all by yourself?
    Somebody stole his protractor! Give him a brake...

  11. #11
    jack of one or two trades Aeroplane's Avatar
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    Quote Originally Posted by 12XU
    Somebody stole his protractor! Give him a brake...
    WINNER!
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

  12. #12
    bluebikefixer
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    Quote Originally Posted by eddiebrannan
    can you really not figure this out all by yourself?

    Just looking for confirmation, man.

  13. #13
    Strange As Angels Fixxxie's Avatar
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    Quote Originally Posted by 12XU
    Somebody stole his protractor! Give him a brake...
    a BRAKE?

    ummmmm.....Brakes are bad........mmmmkay
    Quote Originally Posted by sefb222 View Post
    a good reason to form a demolition derby, for fixed gear bikes and the fools who love them.

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