Common sense tells me that the Suzuki spec in the manual called for 32 psi front, 36 psi rear for the oem tires, of which I got over 12,000 great suzuki miles. The Metzeler 880 spec calls for 38-40 front, 40-42 rear for the "Best performance of the Tire" shown in the Metzeler manual. So I do what any educated, informed person would do, and research the forums, called Suzuki, and Metzeler to get answers. So after shelling out over $350+ for the 880's, I will follow their guidelines for their tires, just common sense to me and my wallet (that is my opinion). As to experience, I have two bikes, now 40 years old and a 38 year old Suzuki that I have had since new that still run like new by following common sense and researching help and opinions when needed. Stuff like changing a oil filter every 10,600 miles or 3rd oil change per Suzuki just isn't common sense to me (another opinion). I don't think anyone in these forums wants anything but good old common sense solutions to keeping their bike going, as easy, economical and correct for as long as possible. If my opinion helps someone, than great, it has worked for me for at least 40 years. And if others come up with their own solutions, I will continue to be open minded to their answers. I think most people can weed out the differences between smarty opinion answers, and ones that actually help solve problems, I think I can. Bottom line is we are all after the same thing. After all, owning, riding and maintaining a bike is a common ground we all share.