When you reverse the wheel do you still get the same measurement value from the same stay? If so then your wheel is not properly dished - it is centered on the hub rather than offset to account for the freewheel.

If, however, the measurement changes then it is probably not a wheel issue.



Run the string up and around the head tube and ensure that it is very tight. Use a thing and strong string not a piece of binder twine. You want to be as accurate when measuring the distance from the spring to the side of the seat tube.



Also, measure the distance between the inside faces of your rear drops. The measurement should be 120mm or 125mm if you are running an older frame set. If the measurement is not either or those, then you do have a chain stays alignment issue to deal with.

I have written a complete article on how to preform this simple frame test and then implement repair. If you send me a personal email, I will send you the link and access information to the article.

Hope this has been a help.