Have these on a few weeks now & they were rolling great & lightweight. Unfortunately yesterday I went to pump them and the valve came out of the tube on one. Pretty odd to see but glad it gave way when I was pumping it rather than on the bike. So good weight, good rolling resistance but valve durability lacking.

Pessime, dopo una settimana di utilizzo entrambe si sgonfiano nel giro di 2 ore…

Ich hatte direkt zwei paar dieser Schläuche bestellt, weil die Pannensicherheit nicht der eines Butylschlauchs entsprechen sollte.Leider konnte ich die Pannensicherheit dieser Schläuche gar nicht testen, weil sich nach kurzer Fahrzeit die Ventile aus der Verklebung mit dem Schlauch gelöst haben, bei einem Reifendruck von ca 5 Bar. Definitiv ein enormes Sicherheitsrisiko, das die paar Gramm weniger Gewicht nicht ausgleichen

Very happy with inner tubes, I brought them as going from slicks to gravel tyres and wanted to save some weight.I took them out on some gravel trails in the surrey hills and ended up lost on mountain bike trails which were rocky and tree root maiden.Not a problem it seems. Very impressed they are proven robust and durable when off the beaten track.Worth a note that the tyres used with these tubes were Continental ride tour and are known for good puncture resistance.Size brought were 700c x 32

There is nothing at all wrong with the TPU tube. But the valve just screws into plastic, and it leaks. Probably half the ones I bought leaked from the valve at purchase, some of which I bought from ali express and some from amazon... they were the same product. I used pipe thread sealant, plus some replacement presta valves, which worked fine, but there is no way to tell if you have overtightened the valve, and if you do, you will find the plastic wall cracks.They are 10 - 15g lighter than the ones I have just bought from ali express with metal valves. Not that the ali express ones have arrived, out for delivery in Evri for the last 10 hours, and we are now 8 hours from the delivery time they gave me.... but if and when they do come, I am hopeful they won't have this problem.

These tubes have been great so far. No punctures in a season of riding, no complaints.Very lightweight too, if that’s your thing…