Flat Attack SV Tubes, 29 x 1.9-2.125/48mm

This sealer really works; pre-injected into a good quality tube. I have used it for years in thorn infested southwestern deserts. On rare occasions, If you park the bike right after a puncture and the hole does not have a chance for the sealer to work (it's at the top of the wheel), the tire might lose air, but if this happens you can pump it up, spin the wheel a few times and the sealer will work when it contacts the puncture. Flat Attack does not clot like latex sealers. Lasts for years. A sealed regular weight tube is much lighter than a so-called thorn resistant tube. These heavy thorn resistant tubes are no match for "goat head" thorns anyway, which will work through the toughest tire and tube combo. You are better off using Flat Attack because a hole in inevitable, but if you seal it, it won't lose air.

I've used Flat Attack for years for mountain bikes to baby joggers and kid's bikes. We live in an area that has these blasted thorns that are easily missed unless you're looking closely for them. I've come home from using the jogger more than once to find a tire full of thorns. I then started putting Flat Attack in my jogger tires and so far I can just pull the thorns out, pump up a little and we're good to go.

I am a veteran of tens of thousands of miles of loaded bicycle touring, world-wide. I have tried pretty much all the sealers out there. Flat Attack is by far the best sealer I've found if you are using conventional tires and tubes. It has only one disadvantage: it is viscous and difficult to inject into a tube from the squeeze bottle. For that reason, I started buying these ready made sealed tubes. Unlike latex based sealers used primarily in tubeless tires, Flat Attack does not dry out, so it lasts the life of the tube. The Freedom tubes are good quality butyl rubber. My most recent tour was a across most of the USA, a 2200 mile tour, on an off pavement (rode the Great Allegheny and the C&O towpath N.P. off pavement). My bicycle is a Tom Richey Annapurna (MTB) set up for loaded touring with fairly narrow high pressure tires to fit 26" rims (Panasonic RiBMo - also highly recommended). I had ZERO flats. I topped off the 80psi tire pressure just once or twice; that was it for messing with my tires. These tubes with Flat Attack are the way to go if you hate fixing flats. I ride the same bike at home in "goat head" country (goat heads or puncture vine seeds are notorious for causing flats here in the Southwest). I continue to be flat free, despite a bumper crop of goat heads over the summer.

I'm done with flat prevention tubes like these and the Slime products. Sometimes they seal, sometimes they don't. Sometimes they seal the valve and you can't add air. Plus they're heavy (weight always matters on bikes) and expensive. The puncture resistant TIRES, like Schwalbe with their puncture number rating, and Kenda "Plus" tires with Kevlar cord work so much better.

I must've missed something here because the tube commenced leaking straight off. Green goo starting coming out of the valve within an hour of being installed in my tire and it was done by my LBS. I went back and had them change the tube, never even rode with the Flat Attack. I was very disappointed because it seemed like such a great idea.

I purchased two of these tubes and had one go flat almost immediately. There was a slow leak near the valve stem where the tube was joined together. I purchased another one to replace the bad one and it leaked in the exact same place. There is a quality control issue with the tubes.

Tell you what.........have not had a flat in 8 months and I ride everyday at least 15 miles. I replaced the rim tape at the same time, so not sure if they have something in common but this product is worth the money.

Pros: eco friendly, family owned and operated company, its made of thick durable material, high quality tube, 5 year warranty and easy to install.Cons: None.i love this tube! i love a company that works towards becoming eco friendly and treats their customers with ease. I tried going to walmart and they didn't have the tire i needed (even though they sold me the bike there) so i had to buy off of amazon. I highly recommend this product to anybody, rather it be a novice bicyclist or a pro on a budget!