I arbitrarily chose 32mm length during a recent single speed conversion project to match up with my new wheels. The wheels I purchased have what I would consider to be minimal sidewall depth, but these presta valves still barely poked through. If you're unsure about sizing with your sidewall, I'd go for the 48mm length instead. It seems to me a longer valve is more attractive than a little stumpy guy barely poking out. I can still use these, but longer would have been better. Heads up.
The tube, much to my surprise, is labelled the same as the old tube which came on my bike, KENDA, made in China. This is embossed near the stem, across from the stem is the Sunlite label in white. That doesn't bother me really, it's just a bit misleading, as this tube can't be too different from other tubes sold as Kenda's.
However, the valve core is removable which was not advertised, and that removable core is leaking air. I imagine once I replace the core it will hold up just as well as any other tube, this is just a disappointing amount of difficulty for what is usually a simple job.
I installed a new tube, inflated the tube to 70 PSI and got on my bike. It was sagging a little so I inflated it to 80. I pulled the pump off the valve and BOOM - out flies the valve of the tube. I could have put an eye out with that thing. From my experience, these tubes are worthless. Buy something else.
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