32 X 18 = 36 X ?- Mtbr.com
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  1. #1
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    32 X 18 = 36 X ?

    20?????

  2. #2
    This is bat country.
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    Almost



    call it 20.

    brought to you by mspaint
    If the rig made the rider, I'd be pro...

  3. #3
    meh... whatever
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    Quote Originally Posted by Bike Nazi
    20?????
    yeppa
    "Knowledge is good." ~ Emil Faber

  4. #4
    That's gonna leave a mark
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    Thanks for the lesson. I'm good with visuals.
    Fat fanatic.

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  5. #5
    Nightriding rules SuperModerator
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    Quote Originally Posted by mtbiker731


    call it 20.

    brought to you by mspaint


    awesome explanation!

  6. #6
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    Drawing. So cool.

    100 points for you !

  7. #7
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    22!

    I come up with a different answer, 22. But then again, I am interpreting your question differently. If you are looking for the same gear ratio, then the above answers are correct. If, on the other hand, 32x18 is the magic gear ratio for your frame, and you want a different ratio using a 36 tooth chainring, then a 22 tooth cog will give you the same chain tension.

    32x18=1.77
    36x22=1.63

  8. #8
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    Quote Originally Posted by bikeny
    I come up with a different answer, 22. But then again, I am interpreting your question differently. If you are looking for the same gear ratio, then the above answers are correct. If, on the other hand, 32x18 is the magic gear ratio for your frame, and you want a different ratio using a 36 tooth chainring, then a 22 tooth cog will give you the same chain tension.

    32x18=1.77
    36x22=1.63
    1.77 = 1.63 ?

    I thought I was bad at math.

  9. #9
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    Quote Originally Posted by long hazy daze
    1.77 = 1.63 ?

    I thought I was bad at math.
    Please read my post again! My whole point is that 1.77 is different than 1.63, but gives you the same chainstay length! Your original post never said you wanted the same ratio, maybe you wanted the same chainstay length for a magic gear for your frame.

  10. #10
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    32:18 or 36:20 are perfect for around here. Upstate South Carolina and various venues across the NC border.

  11. #11
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    Wow, ten replies to a gear ratio question! With a debate to boot.
    "There are those who would say there's something pathological about the need to ride, and they're probably on to something. I'd wager though that most of the society-approved compulsions leave deeper scars in the psyche than a need to go and ride a bicycle on a mountain." Cam McRea

  12. #12
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    No magic for me

    Quote Originally Posted by bikeny
    Please read my post again! My whole point is that 1.77 is different than 1.63, but gives you the same chainstay length! Your original post never said you wanted the same ratio, maybe you wanted the same chainstay length for a magic gear for your frame.
    with only one gear, I need to pick it.

    How about this one
    32 x 18 =
    30 x 16?

    Here's the reason, my bike is geared just right at 32 x 18,
    I'm putting together another bike and have a brand new 16T cog and 36T chainring,
    being the tight ass I am, I'd like to use at least one of them.

  13. #13
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    Riddle me this, Batman............


    ...keeping in mind, I want to keep the chainstay length as close to possible when operating a dinglespeed, with MTB gearing of 32x18. If I install a 16t cog, what front ring will suit me best during high-speed situations?







    I'll need to see your work to merit an A.
    Last edited by lubes17319; 03-26-2007 at 07:20 PM.

  14. #14
    pvd
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  15. #15
    i also unicycle
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    Quote Originally Posted by Bike Nazi
    with only one gear, I need to pick it.

    How about this one
    32 x 18 =
    30 x 16?

    Here's the reason, my bike is geared just right at 32 x 18,
    I'm putting together another bike and have a brand new 16T cog and 36T chainring,
    being the tight ass I am, I'd like to use at least one of them.

    that 16 should be a 17 to make the same ratio(or really close to it). my rule of thumb is 2 in the front is worth 1 in the rear.
    mtbr says you should know: i work in a bike shop.
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  16. #16
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    Thanks, but what language is that!?!?

  17. #17
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    Quote Originally Posted by lubes17319
    Thanks, but what language is that!?!?
    Yeah, that is a little over my head! But if I read the charts correctly, you should us a 34 tooth ring with the 16 tooth cog. The chainstay length ends up slightly shorter, meaning your chain will be slightly loose, but probably not enough to matter. 35x15 should also work. Sorry, but I cannot show my work, I just picked numbers from PVD's chart!.

    BTW, what you are doing is similar to the ENO double/double system. They use a crank with 35 and 38 tooth rings and a freewheel with 16 and 19 teeth to achieve two different gear ratios.

    Mark

  18. #18
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    Quote Originally Posted by bikeny
    Yeah, that is a little over my head! But if I read the charts correctly, you should us a 34 tooth ring with the 16 tooth cog. The chainstay length ends up slightly shorter, meaning your chain will be slightly loose, but probably not enough to matter. 35x15 should also work. Sorry, but I cannot show my work, I just picked numbers from PVD's chart!.
    I was thinking along the same lines as you. I got the closest set-up w/a 34t.

    BTW, what you are doing is similar to the ENO double/double system. They use a crank with 35 and 38 tooth rings and a freewheel with 16 and 19 teeth to achieve two different gear ratios.

    Mark
    Yup. Just hundreds cheeper.

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