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@Samuli
From what I've seen with a few pairs of the basic GK SK over the last few years in 11 different countries, they seem pretty durable otherwise, but they can be weak against glass and the sharp crushed stone that is spread on icy bikepaths in Finland. I've had four or five flats with them that I had to plug. Never problems with sidewalls. Reinstalling old ones can be frusturating as they stretch over time and don't want to snap back onto the rims. Haven't tried the slicks or the Plus'