MICHELINA1 Airstop Smooth Presta Valve 700x18-25C 40mm Butyl Tube Bundle - 4 Pack - New in Box

These work great ... not issues with installation or keeping pressure - first time I've noticed a tire with a Presta valve actually keep it's pressure for more then a couple of dayz ...

excellent service and value

Been using Michelin Airstop tubes for many years, for two reasons:1) They hold air much, much better than standard tubes. I air up 2-3 times per month on my 23c tire'd carbon commuter.2) They resist punctures much better than standard tubes. I can't count the number of times I've ran over some plastic or glass and ended up pulling over to pick the debris out of the tire only to leave a hole in the tire casing while the tube has no appreciable puncture.People often complain of the smooth stems...I use 40mm smooth stems on a 30mm deep rims and have never had a problem with the available purchase for a pump to bite unto. It's merely a matter of not being a moron.

I've bought two packs of these over the last year. The first packed seemed okay, but the second pack has been extremely disappointing. Two of the four tubes went flat immediately after being put on and pumped up, and NOT in the same spot as the tube I was replacing (which would have indicated an issue with the wheel rim or tire). Very disappointed in these.

After I bought these, I realized that I needed longer valve stems, and had to get 52mm ones.

These are my new go to tubes. They hold air well during the long days between rides.

Replacing a tube when I’m riding is not something I enjoy. Trying to add air on the side if the road when The valve is loose makes it so much more frustrating. A threaded valve stem with a nut solves that problem. I will not but these again.

Sturdy so far. I love the way they sparkle, actually. Even though no one can see the sparkle, once they land inside the tire, I know that they will be shining and well protected against the enemies of the road. The Michelin man always comes through