All tire companies make a quality product. Bridgestone, Michelin, Pirelli, Shinko, Avon, whoever. As long as the speed ratings are similar, you can run em all together. The motorcycle doesn't know any different. Lamb will bet that noone can tell what kind of tires are on a bike if they get on and take off without looking. Listening to only what the manufacturers have to say is ludicrous. Lamb is sure that the manufacturers recommend against changing the exhaust, marble mod, extra cooling fan, aftermarket rearsets, HH brake pads, steel braided lines, rotors, aftermarket wheels, etc. Have no fear, mix and match to your hearts content.