Originally Posted by
curiousincident
Since this would be a custom project, you'd just have the frame builder make the rear spacing the same as normal road frames, which means you could end up with just about any gearing you wanted. I'd try to contact the guy behind this build >
http://velospace.org/node/1753
Seems to be about what you're going for, right?
Also, older bikes use 120 spacing, I think I have a 120 6-speed hub on one of my (road) bikes.
But, yeah... you might be able to throw a three speed onto your track bike.