There is a really easy but clever way to perfectly align your rear tire with a simple string. I had an old racer dude show me how and it does work quite well. It works best with jack stands on both front and rear but you must have a rear stand at a minimum. I don't think I can explain it thoroughly without having photos. I will try to get some photos later in the week. You'll see how simple it is but oh so effective. It's really important to have your bike in perfect alignment for it to perform well, especially if you do wheelies. You can't steer that heifer when you are up high if the rear tire is out! I have never had a bike that was aligned perfect with the marks. I have an 04 busa and it is out about the width of one mark on the swing frame. Those marks only get you close.