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I have stock original front wheel/rotors that I swap with another factory front stock wheel/rotors setup(bought used and barely used). The problem is when I go to put on my spare wheel, my calipers won't fit on the rotors unless I compress the pistons into the calipers. Whats happening is I'll slide the caliper onto the disk and the caliper would then need to be brought outward away from the wheel in order to slip onto the mounting points. Basically, the inner pistons would need to be compressed in order for the caliper to slip on. You know that noise sintered pads make? Well, I hear that while riding now without applying the brakes. Could this be that the rotors that came with my wheels are not as worn as my originals? We're only talking a year old here. It seems the rotors are a few mm's outward from the center of the wheel than my original stock ones.