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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)

 05-03-06, 01:15 AM #1 ouch yeah Thread Starter   Join Date: Mar 2006 Bikes: Posts: 16 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) math/gearing help So my bike has very short dropouts that allow for just about no adjustment, it is a conversion. Right now i run a 39/14 which is about a 1/3rd ratio it is a little rough for commuting and recreation all though managable but i was wondering if there was a way mathematically to determine my other gearing options using different cogs and chainrings. any help would be cool. thanks.
05-03-06, 06:06 AM   #2
ajd
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Join Date: Apr 2006
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Quote:
 Originally Posted by ouch So my bike has very short dropouts that allow for just about no adjustment, it is a conversion. Right now i run a 39/14 which is about a 1/3rd ratio it is a little rough for commuting and recreation all though managable but i was wondering if there was a way mathematically to determine my other gearing options using different cogs and chainrings. any help would be cool. thanks.
Online calculator: http://eehouse.org/fixin/

There are also eccentric hubs (the axle bolt is not in the center of the axle) to give you a little more range. As always, Sheldon Brown has the answers, or at least the links to the answers.
http://sheldonbrown.com/fixed-conversion.html#vertical