Originally Posted by
operator
Double chainrings or just a double crank with a single chainring? Can't imagine the former working very well unless the chainrings is spaced really close together and you have exceptionallyl long dropouts. Otherwise you'd have to add/remove links just to switch gears.
Check out Rivendell's
Quickbeam SS/FG.
My bike isn't as dramatic a change but it is effective.
48-44T crankset with 17-20 Dingle. 18T SS on the flip side. I've used the 48-17(76gi), 48-20(65), 44-17(70gi) fixed and 48-18(72gi) and 44-18(66gi) singlespeed. The 44-20 is 59gear inches; chain fits but I've not needed to ride that low a gear.