Originally Posted by
rothenfield1
Sorry to start the question without having the bike in hand, but I’m working out-of-town and will be back Friday. I will remount the wheel backwards and take a pic. I imagine the idea is that if the wheel is off-set the same amount to the other side when reversed, it's the wheel; but if it's off-set to the same side, it's the frame.
Thanks for your interest and advice. It’s much appreciated.
There is one other caveat. The assumption is that the wheel is placed in the same position in the dropouts in each instance. This is fairly automatic with vertical dropouts. There is the possibility for operator error with horizontal dropouts.
Your picture did not make it clear which you had. Here's a link that shows the differences:
http://www.sheldonbrown.com/gloss_dr-z.html . Horizontal dropouts sometimes have adjusting screws to insure that wheels are inserted straight. Otherwise, it's important to make sure the wheel is all the way back in the dropouts on both sides.