Avenir Thorn-Resistant Schrader valve MTB tube (26 x 1.95-2.125)

These are heavy duty tubes. I did not expect them to be as thick as they are and I mean they are thick. I installed these tubes on two of my bikes so far but haven't had a chance to go for a long ride yet. But I didn't have any problems with installation. I removed the original tubes and installed these and I used one of the ORIGINAL tubes as a spare in case I do have a flat. I would not use one of these as a spare as they are about the weight of three regular tubes combined. I have a Burley trailer that uses 20x1.75 tubes and even ordered tubes for it as I don't want any flats. And even if I do these are so thick that I could probably run the tires flat and still keep going.I was leary about ordering these at first but at this time I am very please with this product. Just take your time and make sure that the tire seats itself properly on the rim and I would recommend these to others and I will also update my review of them after I get some miles on these tubes.Since these tubes are so thick and heavy it might take some more effort to pedal because of the rotational force that is involved. I don't think I would use these on my road bike because of that. But for the commuter bike that I plan on riding to work (7 miles one way) or the bike for pulling by trailer it won't matter that much to me. I don't want to fix a flat. If you are planning on riding a long distance (10 to 20 miles or more) stay with the lighter tubes and just carry a spare tube in case you have a flat.

Heard mixed reviews on this replacement, not sure why, about people saying they don't last look. No matter what tube you use, it's going to depend on lots of natural variables.. your weight, the rim, what you're riding on, the conditions etc..Used a pair of these in some old tires (the tires were about 13 years old) for 3 days in the mountains, without issue. Didn't lose any air either. About 150lbs on them.Solid, inexpensive, quality replacements.

The tube itself is durable. but the inflation valve isn't as strong. If these ever go flat, It's most likely the valve cracking or poorly sealed to the tube. As that's the only 2 times I've experienced flats with these tubes.Great tubes for the price.

Purchased these a couple of months ago, zero problems, I ride six days a week some off-road, my tires take a beating. I had to adjust the tubes quite a few times before they would seat properly, i.e. let the air out, slide the tire until the valve stem is strait then reinflate. I increased the air pressure attempting to keep the tube in place. It worked, my tires are rock solid, unfortunately this is causing the rear tire to seperate along the bead (the tire is six months new). I can't fault the tube. Last year I had a slime tube blow up and literally blew my tire apart. If it was'nt so funny I would've been mad. One thing these tubes will make you work slightly harder as their noticably heavier. PS It's been 3 months and I'm still riding! I've added air once or twice in the last 2 months and only several pounds. Obviously from reading other reviews these tubes have issues...but not mine. It's funny, the 'big chain' stores only sell cheap tubes and slime tubes, both of which are Chinese garbage. Seems like a quality tube would own the market! It's a conspiracy I tell you! It's enough to kink your valve stem!

I used to get a bunch of flats every year until I discovered Armadillo tires (they use Kevlar). Even after that however, it was still 1 to 2 flats a year.It was a tad difficult to get it in, but I notice no difference in my ride, and so far, after 1 month and 500 miles on Chicago's city streets, I have not had a flat tire and I do notice that I do not need to refill my tire quite as often.It is too bulky to carry as a spare. I have a standard tube in my bag in case of a flat.Time will tell.<Update - Time has passed and I am less impressed. I did get a flat (understandable as it was a large nail), however as I was checking for holes to repair, I felt air coming from the base of the stem. On its own, I would shrug it off as a mistake on my part perhaps being too aggresive taking it off (which I wasn't). However I am now the third person reporting a problem with the connection between the stem and the rest of the tube, which points, to me at least, to a design or manufacturing problem.Thick rubber tubes are a very nice idea, but for now, I would use a different company. Avenir has a problem with their process creating these tubes.><Update 2 - I had purchased two of these tubes before that 1st one failed on me - mentioned above - and the 2nd tube also just failed on me today at the same place (where the tube meets the valve stem). I was just riding a long and all of a sudden my tire was flat. Before taking off the tire, I did my usual check for something that gave me that flat (glass, nail, etc), but found nothing. Sure enough, the only point of failure was where the valve meets the tube. At least this one lasted a year before failing and I never got a flat in that year, which was over 2,500 miles>