Originally Posted by
IthaDan
backwards= put the the cassette on the side without the deraileur/ the lever end of the skewer on the side with the deraileur. Obviously, you can't ride like this, but you can get a great idea of what you need to fix.
Yes, do this and see where you are at that point.
If your wheel was straight in another frame all signs point to the frame being bent, or the wheel just isn't being centered correctly when mounted.