Originally Posted by
Retro Grouch
What, exactly, are you trying to accomplish? Just a couple of thoughts.
It sounds to me like you are trying to retro fit a coaster brake onto a geared bike frame. Does it have horizontal dropouts? You are going to need them so that you'll be able to djust the chain tension. I'm also thinking that resetting the rear triangls spacing might be easier than rebuilding the rear hub.
Assuming the OP knows what he's doing the only reason I can think of is that his current axle was designed for 126/120 or something in that neighbourhood and fitting it onto a 130 frame would mean not enough axle length.