>>1061192Whilst it could be that the stretch is unequal the wheel dish could also be off. If you don't have a frame that you know is 126mm to put it in you can measure it.
With the wheel horizontal raise it up off a flat surface with two identically sized objects placed under the rim 180 degrees apart.Then measure the distance between the locknut and the surface, you can stack things like coins and they'll get you close enough. Then flip the wheel over and the distance should be the same.