Teravail

Superlight 700c x 28-32mm 48mm Presta Valve Tube

These are working. I bought them to reduce the rotating weight in the wheels of my commuter. Just make sure you snug the valve core into the valve stem with a wrench. These were my first tubes with removable cores. I might have to inflate these once a week instead of once a month. I can do that, I have the technology.

I picked these up for CX racing under my Clement PDX tires (700x33). They work really well and have good feel when paired with those tires. I weigh 160 and run my tires 30/35psi F-R, and only pinch flatted once all last season, when I hit a large rock. Also flatted one other time on a big thorn. In neither case did I feel like a heavier tube would have done better.

These tubes are cheap and they work well. The 48mm stem goes through my deep v rim like it should. These tubes also have red caps which is cool because red matches my bike :)