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Old 09-29-09, 05:15 PM
  #6  
sooprvylyn
I suck, but you're worse
 
Join Date: Jun 2005
Location: LA
Posts: 672

Bikes: Motobecane Fantom Uno-Got rid of the rest when I moved to LA:(

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Couple things- Don't ride a fixed gear with a kid in tow, thats putting him at risk. If you are planning on freewheeling on a single speed then I dont recommend a 15 tooth freewheel-there is only 1 brand made and it sucks hard.

Here is what I do for a situation similar to yours:

Run a flip flop hub- freewheel both sides-or at least the side you will ride with your son on
Use a 16 tooth for yourself, use an 18 tooth with him in tow

run a double crank- Pick a chainring that works for your 16 tooth for the outside chainring, and get one that is 2 teeth smaller for the inside.

My frame is a single speed cross frame that I ride road in a higher gear ratio and off road in a lower ration. At long as you have the same number of teeth on both drive setups your chain can be 1 length. If you want to run 1 chainring you will need a chain tensioner unless you have really long dropouts/track ends.
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