Flat Attack Tube 27.5x1.90-2.125 PV 48mm 0d

Haven't had any flats on the road inn years.;

I put the 26" tubes in my sons mountain bike when he was 10. When I sold the bike 4 years later the tubes were still in and he'd never had a flat despite many goat heads. I also have them in my cyclocross bike with similar results. Now I just ordered some more of the tubes for our road bikes and expect the same results. Bottom line is these work and work well.;

Holds air. What can I say..;

I bought these tubes from a local bike shop. I put them in a 29 X 2.3 tire and they worked fine. The first time I used them was the first recent ride where I didn't get a flat even though I pulled out numerous "goat heads". My riding buddy also put them in his bike and also didn't get any flats (he used to get at least one per ride). The area we ride is full of goat heads. I highly recommend these tubes.;

I have this baby on my kayak carrier which does have to withstand some bumps and rocks even though the loading isn't what a bike with me on it would go - but it is >100 LBS.

I had been buying the Walmart (Kenda brand?") inner tubes that would last anywhere from a week (yes) to 6 months. And with a tube lasting only a week - I tend to figure there's something in the tire that I missed - not so the tube separated exactly on one of the mold marks (mold flashing) on the inside (rim side) of the tube.

This flat attack has gone 7 months and it holds air like no other inner tube (I haven't pumped it up once in 7 months)

One caveat though... Do not release air with the valve stem pointing down - that lets the slime stuff into the valve body and pretty much screws things up. (and it takes a little painstaking work to recover from that screw up)

I realize one good review for a mere 7 months isn't "statistically significant" but after the last 3 Walmart tubes at $5+ each this seems like a miracle.;