I only use smooth stem tubes on my bikes as they do not tear up the o-ring seal on my pump. Smooth stems are hard to find as most manufacturers insist on putting the unneeded threads on their tubes. However they are available here at a decent price. These are good quality tubes too. I have been using them for many years and have never had a flat as a result of a fault of the tube.
Michelin tubes seem to have a better quality stem than other brands. The presta valve just seems to have a more substantial feel to it than others. The tubes hold full pressure longer than others, not necessary to check pressure before every ride. Not sure if it is the quality of the rubber or just better construction. Before getting these tubes, I thought a tube is a tube, they all hold air, but apparently some do it better than others!
These are great tubes. I got some when I ordered some tires a while back. They hold air better than the Bontrager tubes that came on my Emonda. I've aired them up and checked them 2 days later and the tires didn't need any air. Can't get better than that. These are a steal as well, great price for such a great tube. I prefer the smooth Presta too, doesn't eat up my pump head. They may be a little heavier than other tubes but I'm not concerned about weight as I don't race. Going to stock up on them soon.
Good tube for 25 mm wide tires. I prefer the quality of Michelin tubes over others, less seam splitting and the slightly extra rubber helps resist those tiny pin pricks that can damage ultra light tubes. Probably want something lighter to stay competitive for racing. But if you don't like sitting on the side of the road fixing flats during training or recreational rides give these a try. I use tires weighing 215 to 240 gms on my road bike on city and country roads.
My friends and I are always in need of inner tubes. The Michelin A1 Airstop Tube is a bit pricey but always a solid well made product. When they go on sale, I pool our resources together with my friends and order a bunch of them. This is my preferred tube as I cannot remember any of them having imperfections that would cause them to fail without a verified tire puncture.
This tube worked well for me in a recent race. This was the first tube I used with a smooth valve stem and I prefer it. It is easier to attach and remove the pump and with high pressure tires, it seems that shifting of the tube's position is not a problem.
I have been using these Inner Tubes for many years now and have always had good experiences with them from a quality perspective. They are consistently well made and last. I cannot remember ever having one of them fail other than the normal punctures we experience once our tires get old. When these tubes go on sale I stock up on them. Even if they sit around for a while they still work as intended.