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@Potter
Chainring to rear sprocket ratios can be achieved many ways, 48/18 sounds
a sensible starting point.
If you want to be critical about gear ratios don't forget to take the pedal crank
length into account as per Sheldon Brown's link below:
http://sheldonbrown.com/gain.html
It gets just a bit more technical than first thought!
Another thought; Would a 12 (or 11) teeth cog wear out really quick, more strain
on each tooth - the smaller the cog, distribution of force from chain on cog?