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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 07-09-10, 11:25 AM   #1
velo86
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Cog ratios

Hi, I'm fairly new to riding fixed so would appreciate some guidance...

I'm currently riding with a 45 tooth crank and 17 tooth cog - a ratio which is really good for me.

I've just acquired a 51 tooth crank and was wondering roughly what sized cog to use which will be similar to the ratio i;ve got at the moment.

Any advice would be appreciated.
Thanks!
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Old 07-09-10, 11:30 AM   #2
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http://software.bareknucklebrigade.c...it.applet.html
^Go there and start plugging stuff in. I don't know your crank arm lengths or tire/wheel size, but once you plug everything in it'll give you a list of equivalent gears.
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Old 07-09-10, 11:42 AM   #3
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Old 07-09-10, 02:47 PM   #4
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i really use a 21.
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Old 07-09-10, 02:58 PM   #5
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Middle school math.

45/17 = 51/x

(45/17)/51 = 1/x

51/(45/17) = x

x = 19.26666

19 is a bit taller, 20 a bit more lower.
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Old 07-09-10, 03:13 PM   #6
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Quote:
Originally Posted by RobertFrapples View Post
45/17 = 51/x

(45/17)/51 = 1/x

51/(45/17) = x

x = 19.26666

19 is a bit taller, 20 a bit more lower.
Maths be gone!
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Old 07-10-10, 05:43 PM   #7
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thanks for the help - i'm now sorted!
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Old 07-10-10, 08:53 PM   #8
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