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Writing gp4000sII and gp4s when referring to the same tyre (GP4000SII) might confuse given the existence of actual GP4S (http://www.bicyclerollingresistance.com/road-bike-reviews/continental-grand-prix-4-season-2015) which are different tyres.
"4 Season is thinner than the GP4000S II (2.7 mm Vs 2.9 mm). The sidewalls are a bit thicker at 0.7 mm Vs 0.55 for the GP4000S II."
"One of the main selling points of the 4 Season is its claimed high puncture resistance. With a score of 17 points in the puncture resistance test, the 4 Season performs excellently. 17 points is a much better score than the 11 points the GP4000S scored."
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I have used both this winter into spring, 28mm on my tourer. Had to ditch the GKs after many a punc in highly flinty + damp conditions just kept glueing stones to the rubber and I didn't check it enough to stay on top of removal.
Ribmos haven't had any puncs, but they don't feel as nice. Will switch back as soon as I stop commuting along that particular stretch.
Prior to this particular commute this winter I hadn't had any problems with GKs.
Don't confuse 4 Seasons with 4000SIIs