Continental Supersonic Lightweight Long Valve Bicycle Tubes Presta Valve 60mm Bike Tube Bundle (Pack of 2 Conti Tubes)

They are as light as they claim to be, 9 rides in and they are working just fine.Keep in mind that they are supposed to be installed carefully, they are indeed very thin, a dent on the edge of your rim or a poorly used tire lever can easily pinch them, I use a "Tire Bead Jack" to pass the tire over the rim instead of tire levers to avoid pinching the tube, is important the valve is properly aligned, the tube needs to be inflated a little bit before installing so it won't twist inside the tire while being inflated.If you don't have the technique, patience or tools to install this kind of tube you are going to end up believing it is a bad product, but if you are looking for"supersonic tubes" chances are you have had your fair share of tube installation experience.[Update] after a full season of riding (5000-+miles), I have used 4 of these tubes, two of them had to be replaced cause I was using race tires with ultra thin walls and those got slashed on the side on sharp cracks on the road, neither the tires nor the tubes survived, luckily my wheels did, then I switched back to conti 4k2 tires and had 2 flats one was a small screw, and the other a syringe needle, both objects manage to get thru the tire so not the tube's fault. in neither of my 4 flats I had blowouts, all of them lost air quickly but slow enough for me to bring the bike to a stop safely. so yep, I'm here getting a couple more, to keep them as spares.

Great product for riders looking to maximize in every detail.

Have used these for several years. I've learned to install them carefully, using talc and a KoolStop bead jack, inflating them just enough to get them to slip into the tires nicely. If I do get a puncture it happens soon after installing them. Last spring I installed fresh tires with Supersonic tubes I had used the entire previous summer. One of them developed a pinhole leak within a month so I installed a fresh Supersonic, and no leaks on EITHER wheel over the 2300 miles since then. Three thoughts: (1) I don't use them as spares because it's hard to be careful when replacing a tube during a ride, so I carry Conti Race Light tubes as spares. Plus I don't get the advantage of reduced rotating weight if the Supersonics are in my saddlebag! (2) They lose about 3psi/day (not as much as latex tubes do) so I usually add a little air every other day (3) Amazon frequently gets mixed up and ships me 42mm rather than the 60mm ones my wheels require, so be sure to check which version they ship you!

I decided to try these in the interest of saving a few watts. So I ordered some and installed them carefully. Now I've been installing clincher tires and tubes on my bike(s) every since they took over from tubulars, which is to say a long time. The mounting is done right, all precautions and with a bead jack to boot. But it didn't hold air and I found that the tube split along a seam - inside the tire, when inflated. The reviews warned of poor quality, but foolishly I thought it might be my fault. So I returned the first pair as defective and tried a second pair. SAME result! This time a short little split in the tube, but a fault nevertheless. I've put back on my Conti race-light tubes and that will have to be as good as it gets - unless you want to pump latex every time you ride. DO NOT GET THESE TUBES. AMAZON SHOULD DE-LIST THEM.

I am a weight weenie so I will look for weight saving in any part of my bike. A regular tube is around 100g and the Supersonic Lighweights at 50g each tube is huge, one of the easiest and cheapest weight savings out there.Having said that, it is a really thin tube and if you ride through rough terrain make sure you always have the tire pressures spot on. I ride in New Jersey, which is not the best tarmac in US, and I am more than happy, so this is a good test :-)

Carried as a lightweight "get me home" spare. In two cases I had trouble with fitted latex tubes. These seem to not give trouble. I'll be switching to these and take the 12gram weight penalty in return for their reliability.

I am not an expert tire changer, but this tube only lasted one ride. It failed AFTER the ride, a tear through the tube occurred while is was parked. I replaced with another.Note: The tire was brand new, and there was not outside penetration, the tear occurred on the inside of the tube.

Can't really fault these for my mistake. I pinched one of them on install, so I just went with the regular weight ones as I have gatorskin hardshell tires (heavy weight). If saving weight is your goal, these are super light, but either be experienced in installing or take it to a pro shop to install.

Great

i call it junk