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@Sumo
http://www.slowtwitch.com/Products/Things_that_Roll/Tires/Continental_GP_4000_S_II_3946.html
"The main thing that Wurmbäck stressed to us is that this is not a brand new tire, but rather an update to their hugely successful GP 4000S. I consider that to be a very good thing; it breaks my heart to see product designs that go from ‘good’ to ‘worse’ over time. Grandpa was right – if it ain’t broke, don’t ‘fix’ it.
What else is new? Two big things:
A new 650x23mm size (ISO 23-571)
A new 700x28mm size (ISO 28-622)"