Good stuff Ducnut. I've switched all of my race tires over to the Conti GP4000 all season in a 700x25. I also used to swear by 23's but quickly found myself as a convert after borrowing a teammate's bike for a mixed surface race. I'm also the only guy on my team that runs latex tubes in every set of tires. The road feel is simply improved in every way from butyl rubber tubes. They require a bit more attentiveness to air pressure and need topping off more often, but well worth the extra time for the feedback and feel.
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Correlation does not imply causation.