I did my research on both of those sweet wheels, and you're right about the rolling resistance. The 4season has a significantly higher puncture resistance on the treads and slightly higher punc. resist. for the sidewalls. I'll keep the 4Season on my current hybrid commuter. Perhaps I'll slap on the 4000SII racer-like set on my future ALR (5 or 6) Edmonda Trek roadie — I have fingers crossed to get this baby the next time I shop.