There has been a lot posted here about the 4000s and I think I'm going to grab a set. Just to clarify one more time, it's a good tire for every day riding (I group ride once a week and do about 40-50 miles besides that throughout the week) and pulling the little guy in a trailer (about once bi weekly). Thanks again.

One more, what's the difference between the GP4000S, GP4000, and the GP4000 Black Chili?