The build quality is impressive. These tires have a thick sidewall and heavy-duty tread, almost like motorcycle tires, in my opinion. You can definitely feel the weight when riding, which adds to their sturdiness. They’re also marketed as puncture-resistant, and I’m inclined to believe it. I still use FlatOut for added peace of mind, but the tires themselves seem tough. Even though they’re 4-inch tires, they’re a bit wider than the stock Kendas due to the tread extending down the sidewalls. Despite that, they fit perfectly with no issues at all.