The Continental TourMTB 26 Tube has been amazing. Has held air for months now and no need to pump them up again. I have been storing my bike in my home so I'm sure that helps, but my old tubes required refill after a week. These tubes are much better. I've been riding on pavement and on gravel roads and no punctures or problems.
These are quality inexpensive tubes. The valve stem is threaded all the way to the base and there is a nut that goes over the threads. This gives you the ability to secure the valve stem in place making installation incredibly easy.
These tubes are made very well and I have not had any issues with them unlike other brands. It is really handy they come with a small nut to screw down around the value stem to help it in place. It is a big help when trying to inflate a tire.
Quality looked good, but one of the tubes I bought ended up having a tiny pinhole in it near the valve stem. Rode to our favorite restaurant the day after I installed it and had to walk to the bike home with a flat rear tire. Tire was perfectly fine, no holes...so just a freak happenstance I think.
I have over 300 miles on these tubes with no flats. I am using good flat resistant e- bike tires. There is minimal weekly air loss. Far surpass original bike tubes as well as other replacements.
Great tube well made and strong.
Valves are stainless and screw top (presta)
Sturdy. Rubber ring around valve stem to tube are strong and resist flex unlike other cheaper made tubes.
Normally have great luck out of continental tires and tubes. But the first tube I had blew up while inflating at just over 40 psi. Had to run to the local bike store and pay twice the price for a lower quality tube. Kind of disappointing, but the other three held.