Question bout gear ratios- Mtbr.com
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  1. #1
    newbie boobie.
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    Question bout gear ratios

    I had a ride that I was doing at 40x18... mostly city, but this is S.F. man so hills are a pain in the arse.

    But, now I have a 36 in the front, and want to keep that... spot guard an all...

    What rear tooth count would be roughly the same? 14?


    Thanks in advance gear wizards...
    It ain't easy being human.

  2. #2
    giddy up!
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    Quote Originally Posted by donkekus
    I had a ride that I was doing at 40x18... mostly city, but this is S.F. man so hills are a pain in the arse.

    But, now I have a 36 in the front, and want to keep that... spot guard an all...

    What rear tooth count would be roughly the same? 14?


    Thanks in advance gear wizards...
    16, based on the fact that 40 divided by 18 is 2.223 and 36 divided by 16 is 2.25.
    www.thepathbikeshop.com

  3. #3
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    Quote Originally Posted by donkey
    16, based on the fact that 40 divided by 18 is 2.223 and 36 divided by 16 is 2.25.
    It's THAT easy? Man, I am an idiot ...

    THANKS
    It ain't easy being human.

  4. #4
    And He was Not
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    Yes It Is

    I printed, uh um, excuse me, My wife and 12 year old son, printed me a spread sheet to help keep me on top of my gear ratio's.
    I can't even post pictures yet.

  5. #5
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    Quote Originally Posted by donkekus
    It's THAT easy? Man, I am an idiot ...

    THANKS
    A lot easier than cranking 36x16 in S.F.!
    Last edited by pacman; 02-15-2005 at 06:57 PM. Reason: (mistype)

  6. #6
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    Quote Originally Posted by pacman
    I lot easier than cranking 36x16 in S.F.!
    I can't tell if that is sarcasm or not...
    It ain't easy being human.

  7. #7
    Nat
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    Quote Originally Posted by donkekus
    It's THAT easy? Man, I am an idiot ...

    THANKS
    Don't worry, a lot of people make it more complex than it has to be thanks to having heard about "gear inches." Only if you're changing wheel diameter will you have to factor in wheel size. Otherwise, there's no change so it's equal on both sides of the equation.

    From Algebra I (and we always asked the teacher how this applies to real life):

    front/rear = front/rear

    40/18 = 36/X

    Solve for X

  8. #8
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    Quote Originally Posted by donkekus
    I can't tell if that is sarcasm or not...
    No, I look up to someone who cranks 2.25:1, I really look up.

  9. #9
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    Or just use the excel gear calculator I have for download in the Tech section of my tire site.
    mtbtires.com
    The trouble with common sense is it is no longer common

  10. #10
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    Quote Originally Posted by pacman
    No, I look up to someone who cranks 2.25:1, I really look up.
    Wait... huh? 2.25 is tiny.
    It ain't easy being human.

  11. #11
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    Yeah, run Shig's calculator and use your likely rings for the front three and your available cogs for the "cluster" numbers. Print. No need for nasty spreadsheets or manual calculations.
    I would rather have a bottle in front of me than a frontal lobotomy. W.C. Fields

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