I had four flats within two weeks against the inside of the rim with brand K. I ordered a couple of these Continental Tours and a couple of Michelin Airstops to see if it was the fault of my rimrim tape (I never could find any problem with the rim or tape) or if it was the fault of the tube. I put in the Continental and it has been over 30 days and 400 miles of riding and I haven't had a flat (so I haven't tried the Airstop yet). The overall quality of the butyl, the seams, and the valve look better than brand K also.
Well made tube! The valve I really like, because my previous purchase from another company the valve threading doesn't even let the cap go fully on before the rubber tubing stops the cap. Compared to the valve your tub has. It goes all the way to the rim and is made out of a rust proof material it seems. Throughly enjoy my purchase.
Installed the tube on new tires purchased at the same time. If you need a refresher on how to install tubes, read the instructions on the website before you damage the tube. I have had the tubes in for over 2 months now and have not need to add air. My tire are 700c x 42mm. I have put on about 100 miles, so not very much. Tube is holding up well and I like the metal stem.
Tubes are tubes, right?
Seriously, I like that these are a bit thicker. I don't race. I'm not concerned about weight. I just like to think I'm going to go out and ride and come back without flatting. If these contribute at all to my security, they're worth it.
Also, I'm a traditionalist. I like that Conti uses a steel stem with a securing nut. Classic!
I have used a variety of inner tubes over the last 50 years, but the Continental Tour 700 IMO is the best and a decent value as well. In thousands of miles I have yet to see any failure at the stem area (a weak point in any tube) nor have I had any pinch flats. I check the air pressure in both tires before every ride. All tubes leak and these are on the low end. I only need to add air ever other ride.
Just mount them with some talc powder and off you go! No worries.