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I just ordered some of these 406 TPU tubes from Aliexpress. I've been using the Ridenow 406 tubes, but want to try these out. Their main claim to fame is that they come in a larger size. The ridenow go from 18 to 32 mm, these start at 27 and go up to 43 so the idea is the tubes won't be very stretched to expand into a 28 or 32 mm tire. They're pretty cheap too, under $14 for 4 tubes. It will be a while 'til they come in for use and feedback.
Cyclami started offering 406 tubes with the threaded metal stems which I like, but I've only seen them with 65mm stems and that is kind of long for the front tires of a velomobile.

Cyclami started offering 406 tubes with the threaded metal stems which I like, but I've only seen them with 65mm stems and that is kind of long for the front tires of a velomobile.
