Tube material is quite thin - too thin. Definitely forget about using mountain bikes, maybe not even bumpy roads or curbs. These tubes had weird little holes all over them. I copied the first one onto the Pinch Flat but the same pinholes popped up everywhere. I had an old Bell pipe laying around and it was a lot thicker. I held them in my hands and you could feel how thin they are compared to Bell. These hoses are too thin. I've had at least 4 flat tires in less than 50 miles. One tube pretty much broke about half an inch long, not where compression would normally occur. The positive moment was that I am now a professional in repairing apartments in the area.
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