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this is the blog it came from http://bicycledesign.blogspot.com
its not all fixed wheel but there is some really nice designs on there(sorry if it has already been posted before)
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it depends what cranks you have really,there are specific chain rings that will be suitible for you cranks.i dont think you have to do it right away but it is deffanatly somthing you have to consider.search different threads on the forum and read about it,theres sure to be somthing that will help you.
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its what dave would have wanted:)