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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 11-19-12, 01:31 PM   #1
kesher
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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?



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Old 11-19-12, 01:41 PM   #2
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The hub has a standard threading right?

You can get them down to 12t.
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Old 11-19-12, 01:44 PM   #3
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I think so
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Old 11-19-12, 02:23 PM   #4
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You can get them down to 12t.
for real?

http://www.danscomp.com/461085.php
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Old 11-19-12, 02:28 PM   #5
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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..
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Old 11-19-12, 02:39 PM   #6
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You can bump up the gearing via a bigger chainring, too.
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Old 11-19-12, 03:00 PM   #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 03:02 PM. Reason: spell
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Old 11-19-12, 03:10 PM   #8
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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.
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Old 11-19-12, 03:13 PM   #9
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Just how high are you trying to gear this thing?
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Old 11-19-12, 03:16 PM   #10
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Do you really want your gearing to change by that much?
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Old 11-19-12, 04:06 PM   #11
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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.
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Old 11-19-12, 05:42 PM   #12
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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 05:51 PM.
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Old 11-19-12, 06:16 PM   #13
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My bad, misread.
Prob bc of the thread title:

"Minimum Cog Size"
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Old 11-20-12, 03:22 AM   #14
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Just how high are you trying to gear this thing?
On a previous bike I was riding 14t/48
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Old 11-20-12, 09:04 AM   #15
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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.
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Old 11-20-12, 11:21 AM   #16
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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 11:26 AM.
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Old 11-20-12, 11:28 AM   #17
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Just how high are you trying to gear this thing?
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On a previous bike I was riding 14t/48
Move this thread to the track forum.
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Old 11-20-12, 12:34 PM   #18
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I end up walking down some hills. Ridiculously low gearing
...Excuse me?
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Old 11-20-12, 12:47 PM   #19
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...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.
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Old 11-20-12, 02:43 PM   #20
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I personally think you're either crazy, confused or trolling.
Can we set up a poll?
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Old 11-20-12, 03:23 PM   #21
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...Excuse me?

Walking down hill if riding fixed gear (also 18t)
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Old 11-20-12, 03:27 PM   #22
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64" is low, but not ridiculous. Someone needs to learn how to spin.
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Old 11-20-12, 04:15 PM   #23
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64" is low, but not ridiculous. Someone needs to learn how to spin.
Qft
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Old 11-23-12, 12:09 PM   #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.
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Old 11-23-12, 01:24 PM   #25
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This dude is so effin' l33t it hurts
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