Fat Bike Nano TPU tube 45mm stem

Well, dropping 300-350g per wheel makes your fatbike ride more like a gravel bike and less like a dump truck. Spin up is noticeably faster. Tire compliance over postholes is smoother. Still running same 5psi. Currently in the "testing phase" before going out in the deep woods on long treks. One tube is holding air great, the other lost a bit more overnight than I would hope for. Will check back on that, early days. The stem is not metal like a butyl tube, but a plastic material with the normal valve core in it. Assume that the metal doesn't reliably bond to TPU like it does to butyl. And there is no "locking nut" like at the stem of a metal butyl tube to screw down against the rim surface. Thought that was a bit oddly different, but it works just fine. The reported weight is as stated for the tubes. Been using them down to -20C. So far, it's all positives. Note that if your tire bead won't "pop out" Ottalaus says soapy water is fine (in moderation) to lubricate the tire/rim interface and won't adversely effect the TPU. I had more trouble with the beading popping out fully, for some reason, than I've had with butyl tubes. The TPU material is pretty thin (of course), so I wiped out the tire and cleaned the rim contact area thoroughly (then even used shop air to blow out any remaining particles) before install, so there would be no grit to abrade the TPU. Likely overkill, but since they do cost more, I thought some care was warranted. Service/answering questions from Ottalaus has been top notch. Pretty pleased if they turn out to be durable. And, as I run diff tires in the summer, no sealant mess to deal with.

Easy to install, holding up well, no air loss or anything in the first month of riding. So much lighter than the original butyl tubes.

Outstanding service, would definitely use them again.

Dropped almost 1lb/500g per wheel after removing the stock "heavy duty" tubes. I use my fatbike year round and swap studded tires on and off my wheelset based on conditions so not having to deal with sealant is a plus.