Singlespeed & Fixed Gear - math/gearing help

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ouch
05-03-06, 01:15 AM
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.

ajd
05-03-06, 06:06 AM
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