also the shorter you can make the chain stays the faster and better your pedal power is transfered in to momentum. however I do own a bike frame from 1981 with 14 1/2 in chainstays. the rear wheel goes between twin seat tubes. how is that for tight? there is a real down side to this and it prevents you from running a fatter tire x28/x30 if you wanted to soften your ride for a longer tour or bumpy commute.
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk