Nice thick tire but failed (leaked) at thin spot surrounding valve stem. Overpressured? Don't think so. Manufacturing defect, more likely. Swapped to tire liner.

Have purchased 6 of these. First pair lasted thru CV19 and 3800miles. Second pair currently has 1400mi on them and are mounted on my Road/CX wheels. Third pair has only 24mi on them and mounted on my CX/Offroad wheels. Resistance to punctures is awesome.Valve stem mounting and area around the stems are super tight and pop/pull out easily.I added a pic of it. This is the 700x35-40 tube in a 800x38 tire mounted on DT Swiss G1800 wheels. This stem leak is enough for the UNMOUNTED tube to go flat in the time it took to write this review and take the pic.I floated the entire tube, this is the only leak. About to go to the LBS and get a new tube.

After 3 rear tire flats on my new electric bike in a month I got very discouraged about riding. Understanding that hub motor wheels are heavy and I am old and fat added to the problem I purchased one of these tubes. So far very satisfied. About 400 miles in and so far perfect. Install took a little time but not much harder than a normal tube. Overall very happy 😊.

I live in New Mexico, and having some sort of protection against goatheads (which are pretty much just caltrops made by evil plants, if you aren't aware) is pretty much mandatory. I will start by saying that using these tubes, I've never, ever gotten a flat from a goathead. I slime the tires just a little, just in case, so maybe that's helping.No, all my flats came from inflation. I'm not sure if I'm just a noob to presta valves, or if my Planet Bike floor pump just has a messed up presta nozzle, but twice now I've ripped a hole in the base of the valve stem just by pulling the pump off. The pump is a mighty snug fit, and requires a bit of twisting to remove after inflation, but I've used it on tons of tubes in the past, and never had one issue with this. So there's my caveat: they'll do the job, but be REAL careful when inflating them.The valve stem issue is the only thing that keeps me from giving this 5 stars. Otherwise, they perform perfectly in an environment I'm going to assume they were designed for, and despite this flaw, I'd recommend them if you spend your morning bike ride patching tube holes and picking goatheads out of your tires.Update: Okay, I'm not gonna buy this product again. What I had thought was a problem with my bike pump ended up being the tube. This time, the valve stem detached itself during riding, with absolutely nothing aside from the valve cap attached! Completely unacceptable for a tube to fail like that. It earned me an hours walk home and my ire for this manufacturer. Buy rim strips and slime your tires, because while this might seem like the easy way out, you're going to end up with a hole in the tube that you cannot patch. Save yourself the trouble now.

I bought these and they seem to hold up. I've used them once on a ride and a friend got a flat and I did not. I guess that's what was important. They are a little heavy, so I recommend compensating by using a smaller/more narrow tire.I took off 1 star because I ordered 2 and 1 was defective from the factory. The valve stem portion was not correctly mounted to the tube and the rubber wasn't intact so it would not hold air and could not be patched, thus my tip of "order an extra".

Unlike some other reviewers, I've waited several months before posting my review. I don't find it helpful whatsoever to hear someone's opinion about how a functional product looks, or that they haven't tried it yet and can't really offer me any assurances.Anyway, that aside, before I bought these tubes I made a daily commute of about 15-16 miles every day. I rode over all sorts of terrain, but generally sidewalks and streets, some of which were very scarcely swept and which persistently have broken glass littered all over. Under those conditions I was getting a flat every one or two weeks, and was missing classes in college as a result. Not only was it inconvenient, but it was prohibitively expensive to buy new tubes or have to constantly restock patches and vulcanizing glue.So I decided to buy a pair of these puncture-resistant tubes. They're not a lot more than regular tubes, really. Installation was a bit finnicky, though; the tubes are very thick rubber and are much heavier than usual. It was difficult to fit them into my tire, but that's probably because my tires were slightly undersized (there's no danger in getting an oversized tube, it's vice versa that you don't want to do). The good thing is that since they're so stiff the danger of pinching them during installation is slim.I bought a spare just in case I'd have to perform a swap, but, I never even used it! For the past three months I haven't even gotten a single flat. It's practically miraculous. Now I ride over palm trees, debris, glass, and branches and don't even give it any conscious thought. It's certainly saving me a lot of money, and having to remove and patch or swap tires is a royal pain, so I'm glad to have my bike require less maintenance. I had even bought some "STOP Flats 2" tire liners and never ended up needing them. Some people who live in different areas of the continent might want to double up, though, since there are more aggressive species of thorned plants out West, I understand. I live in an urban area in Miami FL and my worst concerns are usually sharp branches and glass.These also operate and feel surprisingly stiff at low PSI, which I like because it makes bumpy rides more comfortable. The valve stem is disappointingly short, but it's still totally serviceable. All in all, I'm extremely happy with this purchase. The next time I work on a friend's bicycle, I'll be replacing their tubes with these.-----------------------------------------------UPDATE: February 2nd, 2013.I think it's been nearly ten months since my last review. Thus far my tubes are, surprisingly, still going strong. My third tube is still sitting unused in my closet. I've been riding a daily commute of approximately 15 miles, which over the past two months has been reduced to 7 miles, giving me a usage over the past duration of around 2400 miles.With that said, I've noticed that the tubes are tending to lose their air a little more quickly now, and I have to top them off marginally more frequently. Of course, since the rubber is pretty thick, when the tire drops in PSI it's not imminently noticeable.Something that's important to note is that these tubes really do weigh quite a bit in comparison to normal tubes. I didn't become acutely aware of it until coming into possession of a second road bike, which I now use to race, while keeping the other cycle loaded with these tubes as a commuter. Since these are basically made for a commuter bike, I don't think this reflects negatively on the product.I'll probably leave another review in a few months again, or when this tube finally needs replacing.-----------------------------------------------UPDATE: August 15th, 2013.This'll probably be the last time I update this review, at least until I begin using my bicycle again, assuming that the tubes are still good! Don't worry, I haven't given up the ghost; I simply appropriate a new Cinelli cycle that's much, much lighter and faster. I still occasionally use my Schwinn loaded with the Thorn Resistant tires, and I can report that they're still holding air and quite all right after riding around on sidewalks and dirty city streets.