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  1. #1
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    Minimum Cog Size

    I've heard that as my bike (Mongoose Maurice 2012) came fitted with an 18t freewheel (large diameter thread) the smallest it can take is either 15t or 16t. I had intended to fit a 13t freewheel; but I've heard that a 13t freewheel has a smaller diameter thread designed especially for a BMX cassette and so a 13t will not fit on the cassette of the Mongoose Maurice 2012. Is this correct?



    THANKS

  2. #2
    Morton Nagrom_'s Avatar
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    The hub has a standard threading right?

    You can get them down to 12t.
    Quote Originally Posted by seau grateau View Post
    No offense but you're an idiot.
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  3. #3
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    I think so

  4. #4
    Senior Member Bat56's Avatar
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    Quote Originally Posted by Nagrom_ View Post

    You can get them down to 12t.
    for real?

    http://www.danscomp.com/461085.php

  5. #5
    Old fart JohnDThompson's Avatar
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    Quote Originally Posted by Nagrom_ View Post
    The hub has a standard threading right?

    You can get them down to 12t.
    No. You can get single, fixed cogs down to 12T, but not single freewheels.

    Single freewheels for standard (i.e. non-metric, BMX thread) hubs bottom out at 15T because the ratchet mechanism needs to occupy some space..

  6. #6
    7-speed doomsday prepper ThermionicScott's Avatar
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    You can bump up the gearing via a bigger chainring, too.
    Quote Originally Posted by chandltp View Post
    There's no such thing as too far.. just lack of time
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  7. #7
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    The chainring is 44t so with its 18t freewheel the gearing is far too low
    Last edited by kesher; 11-19-12 at 02:02 PM. Reason: spell

  8. #8
    The Empire forges on... ThimbleSmash's Avatar
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    If you are keeping the chainring at 44t and want a 13t cog/freewheel that is going to make for a very unfriendly ratio for road use. Going to a 16t or 15t count would be more realistic.
    Look at me, I'm Mr. Meeseeks!
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  9. #9
    Magnets, how do they work solipsist716's Avatar
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    Just how high are you trying to gear this thing?
    Quote Originally Posted by cianm View Post
    How do i tweak my brakes so it will be good for skidding?
    Quote Originally Posted by Sixty Fiver View Post
    As Minchin said, praying before a sporting event and winning does not mean that god took time out from torturing and killing babies in Africa to ensure your team's win.

  10. #10
    I am the Muffin Man Muffin Man's Avatar
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    Do you really want your gearing to change by that much?
    Quote Originally Posted by johnnytheboy
    I've done more ridiculous things than ride 55mi for poon.

  11. #11
    Morton Nagrom_'s Avatar
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    Quote Originally Posted by Bat56 View Post
    Quote Originally Posted by JohnDThompson View Post
    No. You can get single, fixed cogs down to 12T, but not single freewheels.

    Single freewheels for standard (i.e. non-metric, BMX thread) hubs bottom out at 15T because the ratchet mechanism needs to occupy some space..
    My bad, misread.
    Quote Originally Posted by seau grateau View Post
    No offense but you're an idiot.
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  12. #12
    Senior Member mihlbach's Avatar
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    Lots of misinformation here.

    First of all...thread-on freewheels are not cassettes. Cassettes are a whole different animal...they work with a "freehub" and use splines rather than threads.

    Standard thread-on freewheels (the kind that work on track and ss hubs) go down to 16t.

    There is/was a unique 15t freewheel made by AC that fits on standard threads. I don't know it its available anymore, but check shedonbrown.com.

    Metric threaded 15t, 14t, and 13t freewheels are available, but you need a BMX english/metric flip flop hub, which you very likely do not have.

    BMX bikes have small wheels and thus need very small cogs and large chainrings to achieve high gearing. There is no need for a tiny 13t freewheel on a much larger wheeled 700c bike. A 44/13 combo on 700c wheels would be unbearably high for street use.

    Larger chainrings and cogs are more efficient and wear more slowly, so its best to incorporate as many teeth as possible into your drive train.

    Get a larger chainring...this will give you an efficient, long lasting drive train that will allow you to adjust your gear ratio up and down to achieve the desired gear ratio with your present hub.
    Last edited by mihlbach; 11-19-12 at 04:51 PM.

  13. #13
    Senior Member Bat56's Avatar
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    Quote Originally Posted by Nagrom_ View Post
    My bad, misread.
    Prob bc of the thread title:

    "Minimum Cog Size"

  14. #14
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    Quote Originally Posted by solipsist716 View Post
    Just how high are you trying to gear this thing?
    On a previous bike I was riding 14t/48

  15. #15
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    Quote Originally Posted by kesher View Post
    On a previous bike I was riding 14t/48
    And this was on 700c wheels? Do you live in a completely flat area? Also - was this fixed or freewheel? As mentioned above, freewheels for the most part only go down to 16t. Also mentioned above- if you really want a gear ratio that high and have a 44T up front, you will need to get a bigger chainring.

  16. #16
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    Quote Originally Posted by jimbo_tunacan View Post
    And this was on 700c wheels? Do you live in a completely flat area? Also - was this fixed or freewheel? As mentioned above, freewheels for the most part only go down to 16t. Also mentioned above- if you really want a gear ratio that high and have a 44T up front, you will need to get a bigger chainring.

    Yes 700c wheels. I don't live in a completely flat area. It was freewheel 14t because it was the smallest cog on a 6 speed cassette: I took the derailler off and shortened the chain to fit 14t to 48, and so the bike became single speed.

    My current bike at 18t/44 has my legs going round like a spin dryer on the flat, okay for going uphill. I end up walking down some hills. Ridiculously low gearing
    Last edited by kesher; 11-20-12 at 10:26 AM.

  17. #17
    Senior Member Bat56's Avatar
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    Quote Originally Posted by solipsist716 View Post
    Just how high are you trying to gear this thing?
    Quote Originally Posted by kesher View Post
    On a previous bike I was riding 14t/48
    Move this thread to the track forum.

  18. #18
    Magnets, how do they work solipsist716's Avatar
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    Quote Originally Posted by kesher View Post
    I end up walking down some hills. Ridiculously low gearing
    ...Excuse me?
    Quote Originally Posted by cianm View Post
    How do i tweak my brakes so it will be good for skidding?
    Quote Originally Posted by Sixty Fiver View Post
    As Minchin said, praying before a sporting event and winning does not mean that god took time out from torturing and killing babies in Africa to ensure your team's win.

  19. #19
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    Quote Originally Posted by solipsist716 View Post
    ...Excuse me?
    I was thinking the same thing - especially since he said his bike is freewheel.

    OP - feel free to get a new chainring and freewheel to match the 14t/48t setup you had before. If you got a 54t chainring and a 16t freewheel, it would be almost exactly the same gear inches.

    I personally think you're either crazy, confused or trolling.

  20. #20
    Senior Member Bat56's Avatar
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    Quote Originally Posted by jimbo_tunacan View Post

    I personally think you're either crazy, confused or trolling.
    Can we set up a poll?

  21. #21
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    Quote Originally Posted by solipsist716 View Post
    ...Excuse me?

    Walking down hill if riding fixed gear (also 18t)

  22. #22
    7-speed doomsday prepper ThermionicScott's Avatar
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    64" is low, but not ridiculous. Someone needs to learn how to spin.
    Quote Originally Posted by chandltp View Post
    There's no such thing as too far.. just lack of time
    RUSA #7498

  23. #23
    Magnets, how do they work solipsist716's Avatar
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    Quote Originally Posted by ThermionicScott View Post
    64" is low, but not ridiculous. Someone needs to learn how to spin.
    Qft
    Quote Originally Posted by cianm View Post
    How do i tweak my brakes so it will be good for skidding?
    Quote Originally Posted by Sixty Fiver View Post
    As Minchin said, praying before a sporting event and winning does not mean that god took time out from torturing and killing babies in Africa to ensure your team's win.

  24. #24
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    I put a cheap 14t Fixed cog on it today: an improvement; but still too low for me. Looks like it will be the chainring next once the chain is worn out. I might try a cheap 13t in the mean time, though 12t would be nice if I could find one.

  25. #25
    Magnets, how do they work solipsist716's Avatar
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    This dude is so effin' l33t it hurts
    Quote Originally Posted by cianm View Post
    How do i tweak my brakes so it will be good for skidding?
    Quote Originally Posted by Sixty Fiver View Post
    As Minchin said, praying before a sporting event and winning does not mean that god took time out from torturing and killing babies in Africa to ensure your team's win.

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