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They sound good... http://www.bikeradar.com/road/gear/category/components/tyres/road/product/review-specialized-s-works-turbo-cotton-48704/
"the Turbo Cotton is basically tied with the GP4000S at low yaw angles (up to 5deg), but then the GP4000S results in up to .010 m^2 lower CdA at 15deg of yaw. "
http://bikeblather.blogspot.co.uk/2014/07/theres-new-sheriff-in-town.html
hippy
the specialized's come in 24 as well, might be an ok middle ground...