I ordered 2 pieces. This hose is bulkier and heavier than conventional bicycle tubes, because he has a specially shaped surface of the tire side and containing a sealing gel.
These 2 tubes I then tested on bicycle tours in the Black Forest.
Whether the self-sealing hose its effect now spared the breakdown in perforation of the tread, this case did not occur to me. Still, I can report on margins with the hose.
Hose 1 - Episode 1: After 3 days of the first hose was useless - but not by a perforation. At the rear mudguard was loose. An Allen screw was lost and had to be screwed on the inside of the mudguard. I wanted to save me To disassemble the rear and had the air let out of the tires in order to get space for the Innen6kant screwdriver. When I tried to inflate the tire again, I had to fesstellen that the valve was clogged Duch the sealing gel. Whether the hose by a new Presta valve could be refloated, I could not test for lack of replacement valve.
I was nothing left other than the rear wheel but to expand and replace the hose with a new one (tube 2). - In the leaflet is not made clear on this issue point!
Tube 2 - Episode 2: Unfortunately, I was also with this self-sealing hose not spared the spontaneous blowout. After 300 km it had a hole on the rim side, he could not repair it yourself.
I then put the rear wheel on a bicycle mechanic. The said it would probably be at the rim tape. On this occasion I can replace everything that may have to do with Panne: tire, tube, rim tape. I hope that I will now have peace.
Final assessment: If holes are formed at the edge or rim of the hose, the sealing gel is ineffective. In contrast, the sealing gel creates new problems, both technical as well as health. It attacks namely to the skin. That can happen very quickly if handled while inflating the valve.
If you want to have a flat tire, should primarily on a tire with armored tread set (eg Schwalbe Marathon Tour). I had the Schwalbe Marathon (a predecessor) never had a mishap by perforation of the tread.
