Well, I guess they're better than knobbies.
I ride in Detroit, world's epicenter of broken glass and other sharp debris.
Sure, I sometimes go a couple of months wo a flat, but more often it's every 2 weeks, or so. They're just so darned soft. I could probably shove my fingernail through them if I tried hard enough. The side walls are kind of like Tyvek. Probably the thinnest sidewalls I've ever seen, in fact. They're also pretty heavy tires.
All of that being said, they're definitely faster and smoother than knobbies. In retrospect, though, I'm not sure why I went for 2.1 inches of surface contact for an urban tire. The rolling resistance is off the charts compared to my other bikes. I can cruise at 18 - 22 mph, but with considerable effort. It just always feels like someone's tugging at me from behind.
In summary, I'm not completely sure why these tires exist.
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