Either thought tires have the same "size" there are different profiles between manufacturers and even models from the same manufacturer. When I bought my 2000 Triumph Sprint ST it had Bridgestone tires on it (I think BT-023), I never really liked them. I replaced those with a set of Metzler Roadtec Z4 tires which seemed to have a much better tip in then the Stones. I replaced those with some Michelin PR2's which had a much more similar tip in to the Z4's. I think that I read where the Metzler and Michelin tires are more triangular in profile than the Bridgestone tires.