I was looking forward to trying out these WTB TPU tubes but front flatted before my first ride. Had schwalbe, continental, michelin and Vittoria latex tubes and never had an issue. The Zipp rim strip was completely fine but the WTB tubes had a puncture on the inside towards the rim. I never use tire levers to install tires. Maybe I got defective one as the rear WTB TPU tube seems to be holding air fine though I'm not confident - we'll see. They are very light though!
Out of curiosity I bought three road tubes, intending to use them on a rim brake Fulcrum Zero wheels and having a spare in the bag. They installed easily, I just put a few pumps of air into the tube and mounted the tire/tube. The tire was a brand new GP 5K and I had to use a tire tool for the last section. Usually I'm a little paranoid about damaging a tube with the tire tool, but the tpu tube held its shape out of the way of the bead. That is reassuring if I need to install one on the side of the road.
The tubes hold pressure better than latex and are similar to butyl. I had to pump the tire up to 110psi to seat the tire before lowering it back to 85psi. No issues. I would certainly buy again.
The WTB NanoAir 700c TPU Road/Gravel tube is a decent tube. I bought 2 of them along with 2 Vittoria Zaffiro Pro Graphene 2.0 tires. One of them has probably over 1000 miles on it. And it holds air really well. I don't think I've had to add any ever since I put it on the bike. The other one got 2 pinch punctures and another puncture the first ride out and all at the same time. I tried patching the punctures. But, I couldn't get it to hold air. Which was really disappointing to me. Because it didn't hurt the tire at all, and there were no punctures in the tire. But, to be totally honest, I plowed down a chip seal road that has some really bad spots in it. So I'm not surprised that it may have gotten one pinch puncture. But, the other one and the other puncture was an unpleasant surprise. I'm probably going to get a few more for spares for my other bikes. Because they don't take up much space in my seat bags. And I have a tendency to also get a lot of punctures on my gravel bike. And I occasionally get punctures on my other bikes if/when I'm being careless.
Though I haven't actually used this WTB TPU tube on a wheel yet, I've been carrying it as a spare in my bike's saddlebag, and at least for that purpose, I think it's great. This TPU tube can fold up into a very small shape, and it feels very lightweight as well, compared to the traditional butyl tubes.
Additionally, the tube's packaging includes a couple of patches and alcohol wipes for repairing punctures, if that would ever be needed.
I am giving 5 stars for overall rating because I like it better than 2 other brands of TPU I've tried (Tubolito, Rene Herse.) Both of the other brands had one of the 2 tubes defective. WTB was easy to install. I have punctured twice however. 1st time a tiny thin wire went thru a thin, not puncture resistant tire. I don't fault the tube. I patched it successfully with one of the 2 included patches. I think it's great that they include these. The 2nd flat was caused by the same wire! I know, my stupid mistake. I did find the tiny cut, and looked for the sharp object. Did not find it until looking the 2nd time. I patched it successfully the second time. I had the 2nd patch that came with the tire, but used a Park instant patch instead. I wanted to try it to see if it worked, as some people have said it likely would. It's working.
I had to change to more durable tires because of so many flats. I put on a heavier tire and then used the WTB NanoAir TPU tubes because of the light weight. The net effect was slightly lighter weight and NO FLATS.
Very good puncture resistance. Cant believe how well it has held up after a few gravel rides.
