I'm posting this in the section because I'm sure others have wondered why new tires make their bike feel like it doesn't have the same power that it had previously. I just recently went from the stock qualifiers to the Michelin Power Pures. The bike doesn't want to come up as easy as if it has less power. Now I wonder if that's from the extra weight that I added with have more meat on the tires as compared to my old ones that were worn out or does it have to do with my chain being a little bit tighter now. I'm leaning toward the extra weight the rubber added.