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The modest tread patterns being referred to, are a world away from the "large rain channels" carved into those Guttersnipes. The idea being that a lightly "rippled" surface can better match the imperfections in even the smoothest tarmac.
I'm quite sure that the "Certain tread designs" referred to by Bike Radar (Wheel Energy), don't include anything so blatant as what PlanetX are punting.
What struck me was Wheel Energy's claim that "...medium-count casings (around 60tpi)... ...As compared to 120tpi casings, they can actually roll faster..."!
Either way, all the contributors that Leonard Zinn quote make plain that bicycles can't aquaplane and tyre pressures and a supple casing & tube are significant in keeping you upright in the wet.
All of which I take as an endorsement of my choice of Open Pave and latex tubes, run at 85/75psi.
But I would say that wouldn't I? :)
@Scilly.Suffolk
http://www.bikeradar.com/gear/article/bicycle-tires-puncturing-the-myths-29245/
http://velonews.competitor.com/2014/05/bikes-and-tech/technical-faq/technical-faq-tire-grip-wet-conditions_328827