i have a very big birthday coming up & plan to celebrate/thumb my nose at father time by riding fixed for a certain high mileage number up our coast highway on the east coast.

op, if you think you may need a bit wider variety of gearing, here's my own plan:

i have pretty long trackends & use a big chainring - going to throw a 17/21t dinglecog on one side & split the difference with a 19t cog on the other.

am figuring this set-up ought to enable me to handle just about any terrain. my calculations tell me it will fit my bike & chain, hope they are right...i'm not so good with this higher math stuff

whadaya think?