🚴 Michelin A1 Airstop 700x18-25c Road Bike Tube Bundle with 52mm Smooth Presta Valve - Set of 4 Review

Great product. Many tires need to be pumped up about every day to keep the pressure between 100 and 120 psi. I can ride it for up to 2 weeks without having to pump more air. Good product.

The stems and valves are strong, the valve stems are unthreaded which I really like. Smooth valve stems seal better and tighter and fit more easily on the pump head. Threaded rods are more difficult to assemble and disassemble from the pump head and are more difficult to seal.

I bought these through Revain and they are a good product at a reasonable price which arrived in good condition. The only problem I had was that from the moment I ordered this product it took almost three weeks to arrive. Looks like they've been stuck in the USPS with no movement for over 10 days. So much for 2-day shipping and Prime.

Update: I found one of the tubes that wasn't thrown away. That's about 15-20 kg. Print. It swells in the material on the valve stem and bursts within 2 minutes of installation even if you don't ride it. It's garbage. Tubes are actually great when you can get good ones. What you could get half the time. I opened one and it was a bunk. That's why I opened them all. I got 2 that weren't junk right out of the box. You have a serious need for quality control. Opposite the valve stem, the rubber was…