Because the factory engineering staff published a bulletin for all dealers stating that the Rolo laser alignment system is the best way to align Spyders. Because the inventor, Mike Loescher, has a patent on the device. Because thousands of people have had it done and are totally satisfied. Because the lasers connect to the center of the wheel. Because it is based in math. Why not read up on it? See Spydercomfort.com. Click on NY dealers. Find one near you. Most check it for free. We do. If it is within spec, it is free. If not, it is plain to the naked eye how far off it is. Get it aligned. Go ride it. Feel the difference! Three of the most knowledgeable men I know (Lamont, Spyderpops, Len) all have and use this system. In fact, I asked them if I should get one. All agreed: it is the best way to align a Spyder. Less than 1% are within spec, from the factory, in my experience.