Bibike 2/4-Pack 700x 18-32c TPU Inner Tubes with 45mm/60mm/80mm Presta Metal Valves

Excelente, ya llevo 1000km todo bien, el único detalle es que pierdes presión, debes revisar la presión la noche antes o minutos antes de cada salida, pero luego a eso todo excelente

Light weight, easy install. Small packaging makes it easy to bring a spare. I popped one on the 3 or 4th ride. Hit a decent size rock on the pavement. They obviously cost more than rubber, and I can’t tell a difference riding. But I’ll probably stick with them.

I decided to give TPU tubes a try since I have multiple bikes and it has made tubless a bit of a pain. I have it in three bikes now and all 6 tubes work perfectly. They hold air! They do not lose air like butyl tubes and even tubeless. I don't have much miles on them so far, so I cannot validate how robust they are.

not bad but could be a bit stronger in durability

I was a bit skeptical! I was wrong.These inner tubes are great. I am not going tubeless anytime soon.

I haven't been using TPU tubes for very long, but over the last 6 months I've tried a few different brands, but none of the "name brands" that are selling for 40 bucks a tube. I haven't noticed anything negative about these tubes, they're a little delicate to install but nothing out of the ordinary if you are used to doing latex for example. Just don't go fast and make sure you don't pinch the tube along the way.The cool thing is they hold air almost as well as butyl, so you don't have to air up every single day (I still check). I have a couple tubes that are under 25g, but I think that's too light, the ones in the 35g range are plenty light and having that 10g extra of TPU does seem like the tube feels more sturdy.I also haven't tried to patch one, I can't imagine it'd go well, you're basically trying to get a patch on sonething that feels like a sandwich bag, and is 20mm wide tops.All in all, it's very noticeable if you go from a 100g butyl tube to a 33g TPU tube, the bike does feel snappier, but only when you are first starting out and paying attention. The first time you're 4 hours into a ride, fighting a bonk, on a hot day, you have a heart to heart with yourself and realize the old butyl tubes weren't the issue......They're fun, price is right, give them a try though, if anything, you can carry 2 or 3 of these for every 1 butyl tube, more chances to get home safe and sound if you flat.

You have to be very careful installing the tubes, the first lasted a few miles. The next made it home, but then went flat overnight. This experiment is over, I am going back to the heavy name brand tubes.