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Joebob, I am not really sure if I can really tell the difference in rolling resistance between them. I like Vittoria and Conti 4000 on all my other bikes. If I had to choose, it would have to be the 4000. I know flats are a big PITA, but that's part of riding. I take a good fast tire any day over durability. Pump it another 5-8 lbs over what you have now and the rolling resistance will be reduce by 10 folds.
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