Okay, I bought these inner tubes along with a new pair of Michelin Protek Cross tires.
I got the 26 x 1.6 tires, and so I got the 1.5 -1.75 tubes to have the lightest weight set-up.
Not even a full week of riding, the rear tire went inexplicably flat.
There was nothing in the tire, and the whole rear wheel was brand new, freshly taped and good to go.
I had to replace it with an old 1.75- 2.00 tube which is working okay.
Two days later, the front tire went flat, again, nothing stuck in my tire.
Upon close inspection they almost appear to be small splits rather than punctures.
If I'm wrong about this then somebody should explain why to me?
I had 2 flats within 2 days of each other and before that, I went over 10 years to accumulate that many.
My BMW eBike came equipped with 28 Rodi Airline Plus Rims with Schroeder valves. The 29 Kenda tubes I purchased came with a standard length valve stem. I learned my Airline rims rims require a 14 (6.35mm) longer valve stem. so I can use my air compressor to air up my tires. Other than the length issue the tubes fit very well. I would recommend the Kenda Brand.
I only recently installed this tube. From the looks of it it appears to be a quality made tube and is made in Taiwan. The tube also seems lighter than the stock Kenda one made in China.. However I can not tell a difference while riding. I have run many different brands of tubes on my bikes and I honestly don't see a measurable difference with my type of riding. No significant air loss while bike is laid up. I rode some pretty knarly single track recently with roots,brush and rocks etc and they held up fine. That's all I have and I hope to get high mileage from them.
For the price, the quality of Kenda tubes cannot be beat. I've used some for as long as a year. I've never encountered an issue with the tubes. I see no reason to pay more for the same thing.
I've been using only Kenda tubes for my road bikes for years and just bought these for my new 29er. If installed correctly, they'll last for...ever. On the road bikes, I pair Kenda tubes with Specialized Armadillos. These are just backup and the stock tires on the 29er have to puncture protection so we'll see what happens.
Ok after having one tube that wouldn't hold air at all, which was quite annoying, the others have performed their task admirably. A tube is pretty much a tube and these qualify. So I revise my previous review.
BTD reads the reviews and acts on problems swiftly.
My opinion has always been that a tube is pretty much a tube. So far, one out of three won't hold air. There are no bubbles when I put it in water and the bare tube stays inflated but inside the tire it leaks down in under an hour. I'll go for better quality next time.
I wish they would make these schrader tubes with a presta type of threaded stem without the thick rubber coating. I'd like to see the threads on the outside of the stem and a locking ring like on the presta. I don't see why they can't do that. The innerworkings of the schrader would still be the same. I had to drill out the rim for it to fit properly and hopefully I didn't compromise the wheel.
I'm a daily year round commuter, 18 miles per day.