Michelin A1 Airstop Presta Valve 700x25-32C 40mm Bicycle Tubes - 4 PACK w/ BONUS Michelin Sticker

I have ridden since 1988 so I have bought a LOT of tubes in my life. At 40-50psi in a 32C cyclocross tire, these lose a bit more than 5lb in 24 hours. In a 25C road tire they will lose 12-15psi overnight. Does not seem like any air is stopping. If they are cheap, buy them. Can't recommend paying more for the Michelin name or for the air leakage.

Generally good.Does not contain a nut to lock the presta to the wheel rim.

These tubes are great for two reasons. One, they hold proper air pressure for a few days, and two, the "threadless" design doesn't tear up my pump head. These are the only tubes I use on all our bikes.

great tires, nothing special about them,

Stem length a bit shorter than expected and a tad big in my tires but inflated fine.

Easy to install on rim and pump up. Be sure to follow the instructions or you may accidentally pinch the tube.

Awesome deal

These tubes seem to be quite inferior. Two of them have split on the seam the first time I used them. I have contacted the seller to ask for my money back; will update.