Tinea Pedis wrote:crr isn't the whole picture, as this blog demonstrates
http://bikeblather.blogspot.fr/2014/07/ ... -town.html
tl;dr the 4000s isn't close to the 320TPI tyres in rolling resistance. But makes up a lot with its aero profile.
I'll even hold back from an equally snide reply related to riding before you write
if you hang out on slowtwitch alot... you'll also find that Tom A. and others have pretty much determined that the aero properties of the GP4000 go out the window pretty quickly once they start to wear. Plus, the gp4000 needs to be matched well to your wheels... which not all are.
in the end, it's a 'system' . you want the lowest combination of aero properties and Crr. a low Crr can make up for alot of aero sins, as Tom A has said... so I would honestly go with the lowest Crr you can find ( with an acceptable level of puncture resistance you're comfortable with....). the aero poperties of the gp4000 are good to have but are probably not that much of a big deal.
some of the standout tyres IMO are:
specialized turbo cotton
zipp tangente speed ( new model)
Vitorria corsa and coti supersonics ( if you have good roads)
conti GP force/attacks and GP 4000s
any o the above will, really give you pretty good performance.