Thank you, it's definitely felt----a bit subtle (you'd have to pay attention to it.) There will be more weight savings to come after switching to a lighter (and slightly wider tire.) The Sumitomo P02 175's on it are 17 lbs. which are among the heavier tires out there (average is 16 lb.) There's an VREDESTEIN 185 width tire at 15 lbs. I intend to go for.The 5.2 lbs of weight savings is huge. good score there.