I had these tubes on my bike for around 40 miles now. A few weeks ago my rear tire and tube were punctured by a screw on the road. The tube hardly leaked any air and I was able to ride four miles home. The next day when I checked the air pressure prior to repair, there was only a three pounds psi loss from the previous day. These tubes do hold air when punctured! I highly recommend them.
A fairly robust tube - I use these on my '07 Jamis Supernova - the bike I subject to the most abuse - rain, degraded tarmac, dirt, gravel, grass, lunchtime rides from work, and so forth. They usually hold up pretty well. This tube replaces one that'd been on for a couple of years but got punctured when its Clement Xplor Ush was holed by a thorn-sized pyramid of sharp glass.
I use these tires on my gravel bike. I ride about 22 miles each day. Initially the tires were very stiff and cornering felt uneasy to me. After the first 100 miles, this effect was completely gone and corners nicely now.
Here in Arizona we have to deal with A LOT of thorns and goat-heads from trees and plants are really hard on tirestubes. I've got over 300 miles on the tires now and not one flat tire!
Bought 2 of these tubes. First one split at seam. Second got small pinhole, slow leak so does not seal
or stop leak as advertised. Just another overhyped overpriced cheap quality tube.
I have a 700c wheel set with the Michelin Transworld Sprint 35mm tires on them, which I also purchased here. These are the best tubes for overall use and commuting. They are light and strong, and have a nice polymer dusted on the outside, which feels great and mitigates the tube from sticking to the rim or being punctured by the tire when being inflated. And even if they are punctured, its worth patching and re-using them, which is better for your wallet and the environment. You just can't go wrong with these tubes so just go ahead and order 3 and you will be set for years. Thanks BTD.
Bought these tubes at the same time to match up with newly purchased Michelin City 700 tires for my and my wife's Hybreds....put them on myself and had no problems with the tubes fitting properly in the tires. Perfect Match!
Bought two A3 Airstop tubes. After about 300 miles, the reinforced rubber where the valve stem meets the tube gave way. I will give two chances, but not three.
Am using these tubes on a Cannondale Hybrid. The tubes are well-constructed, unlike the cheap tubes carried by my local bike shop. The stem length supplied is just right for the rims. The tubes installed easily and hold air well. They are a good cross between light and durable. I bought an extra tube to carry around in case of a flat. The shipping was fast and accurate and the prices reasonable. A good first-time experience with this vendor.
I got very tired fixing flats on my skinny go-fast tires. I figured I wasn't saving any time by going fast and fixing flats so I went with the Michelin City and the matching A3 Airstop tubes. It's been over a year and well over 1500 flat free miles later I finally picked up a thorn. That reminded me how nice it's been not having flats. Yea! If I ever wear out the tires, I'm going to do it all again.
I bought two of these tubes to go with new Michelin tires, when arrived one tube was hanging out of the box, had large hole in it, in other words dead on arrival,other tube was Ok. Not worth the hassle to send back. Won't buy anymore of them.
Have been using these tubes for a few years now, they hold up pretty well. I ride 1,300 mi. a year, mostly on the road, still get one or two flats a season, but that might be in part to well worn tires. They hold air pressure much better than an average tube, I always try to keep one of these on hand, but last year I had a flat and the bike shop put one of their tubes on the front wheel. I noticed after a couple weeks the wheel with the Michelin tube will have 10 lbs. more air in it than the bike shop tube.
Great tubes, got about 500 miles on them, not a single puncture. I also noticed they don't leak air as much as standard tubes. Less topping off. I did notice they were slightly heavier than standard tubes...