To be honest, I wouldn't choose the GP4000 for winter. It was designed as a race tyre so though the grip is good, that would be in optimal conditions....meaning dry or moderately wet roads. Also, they're extremely expensive and harder to source. Based on that, I examine your criteria a bit more closely before making a purchase. Hidden flints and things in slush would also illustrate that its good for a race tyre at puncture protection, but not in the same league as other, probably heavier and slower tyres. There's always going to be a trade off. For weight-to-puncture protection, I don't think the Maxxis ReFuse has many challengers. Obviously it can't compete with the Schwalbe Marathon Plus or Halo Courier Berlin tyres, but at only 240 grams for the 700x23 tyre, its one hell of a tough tyre. Slower than race tyres, but much lighter than the heavy bulletproof ones. Thats my 2p.
To be honest, I wouldn't choose the GP4000 for winter. It was designed as a race tyre so though the grip is good, that would be in optimal conditions....meaning dry or moderately wet roads. Also, they're extremely expensive and harder to source. Based on that, I examine your criteria a bit more closely before making a purchase. Hidden flints and things in slush would also illustrate that its good for a race tyre at puncture protection, but not in the same league as other, probably heavier and slower tyres. There's always going to be a trade off. For weight-to-puncture protection, I don't think the Maxxis ReFuse has many challengers. Obviously it can't compete with the Schwalbe Marathon Plus or Halo Courier Berlin tyres, but at only 240 grams for the 700x23 tyre, its one hell of a tough tyre. Slower than race tyres, but much lighter than the heavy bulletproof ones. Thats my 2p.