Quote Originally Posted by KnottedYet View Post
125mm rear spacing. I can't find a 125mm rear hub in Harris Cyclery's singlespeed hub list.

Is that going to be a problem? I know nothing about wheels...
It's likely 126 mm, which was the spacing for 6 speed freewheels. Easy to adjust the hub width by a few mm by chainging the spacers under the locknut. Or within a couple millimeters, you can just spread the frame by hand as you insert the hub.