I have been in the process of doing the Glide Pro alignment again. I had the S&S 124 with their cases just installed in the bike and I'm having a heck of a time getting it the way it was with the Harley cases. The bike is completely stripped, no exhaust or anything to stop the motor & tranny from moving freely. Offset or not the tires have to run parallel with each other. You could tell if you had an offset by putting down a line on your lift for reference and centering your tires once it is aligned to near perfect specs. One thing that gets overlooked is checking the rotors for straightness if you are going to use the magnetic lasers. Just make sure your swingarm bushing are in decent shape and that one side is not resting on the swingarm. I have seen that on a few bikes when checking them out. When I notice unusual tire wear on a parked bike I look them over closely and have often found the bushing resting or flat on the swingarm. It takes time and can be a pain the butt but if you get it right it will handle quite well. I'll be back at it today.