Well, here's the dilemma. I have a 87 Rock Hopper MTB. Its a fine bike. It is spaced to 135mm in the rear. I have a Sturmey Archer AW 3 speed hub all ready to go (Just have to buy spokes so I can build the wheel) but when I did a test fitting a couple of nights ago I realized that the hub is VERY narrow at 118mm. My fixed wheel hub is 135mm. So, I either ebay the 3 speed hub and the brand new shifting bits I just bought for it, or I try to make it work.

The only thing I can possibly think of is to re-space the frame to 126mm. That would be 9mm to stretch to 135mm (4.5mm per side) and 7mm to stretch to the 118.8 hub.

Am I crazy? Is that possible? I want to be able to use both wheels (fixed/3spd) but I don't want to mess this stuff up.

Any guidance/advice/etc is appreciated!

PS- I do have a spare frame that I can use to test out spacing. Should I just try it on that?