Pleasantly very surprised, but after new Pro4 Endurance on the back and Power tires on the front, and using these tubes, I haven't had my usual flat every 2-3 weeks. These have changed my mind about all tubes being the same. Apparently not. Very impressed.
ride six days a week, near the 10k club in annual miles. predominate three bike selection with competitive fit profile. Increasing interest in occasional gravel routes.
air loss is about 3% per day
longer stems, (48mm), unless gently handled on air fill, have more valve problems (bend or break)
more problems, minor presta valve bendingoccasional break, with 23 verse 2528 tubes. Why?
flat occurrence is minimal for initial 2.7k - 3k miles. Buy on deal and just change the tubes out.
flats consistent across several tire brands, though tubes with my Michelin 25c tires are flatting more
This is my go-to inner tube. It's not too heavy, a good compromise between strength and performance.
The seams are not raised like some, so it's easier to patch. A note of caution Be sure the removable valve core is properly seated. We were bothered by a slow leak from a slightly loose core. The price from BTD is always good.
I bought these tubes because I didnt want to risk popping latex tubes during descending. Iv our about 1000 miles on them and they have held up well, no Airloss or punctures.
These Conti inner tubes are as reliable as any brand and are available in 60mm stem length. Not all 60mm stems are as long as these. For instance, I bought a 60mm OTC Bontrager inner tube at my LBS, but the stem was too short for my 52mm rim height wheels. So I was unable to get a tire pump on the stem to pump up the tire. Additionally, I am happy that the Conti has a removable core, which allows it to be removed and inserted in a stem extender. The Conti inner tubes seem to hold air well and need very little topping off after two days. But, they will flat just like any other inner tube.
I bought a couple of these tubes to use in an old school single walled 27 wheel. I liked the stem size. At 42mm instead of 48mm (too long) or 32mm (too short), these were the goldilocks size, just right.
But what impressed me most is that they held air pressure better than most any other light weight tube I've used. So I tried them in my 26er and had the same results. Before I knew it was was switching my 700C wheels as well.
I know many will say a tube is a tube and only as good as the tire that surrounds it. But for me, the light weight, perfect stem size and proven less air lose makes this my choice for tubes going forward.
Sure, it is just a tube. But have you ever really considered the gravity of your decision when selecting a tube for your bike? Some tubes are made from crappy parts or fall apart. I cannot count the number of times that Kenda-made tubes have had valve stems which bend/break or generally deform. Continental tubes cost a bit extra money because they are quality parts. These are not high end frou frou race tubes which need to be treated with extreme care and cuddled throughout your ride. These tubes are for when you want your tire to stay round, not break valve stems, and generally be the last thing you worry about. This is not to say that there are not downsides to this tube. If you run over a thorn, some improperly disposed glass beer bottles, or if a youth decides to slash your tire with a butterfly knife, then it is likely that your wheel may go flat. This is after all just a bicycle tube, not an indestructible ring of fury and speed. But, I am confident that this is the tube for me, possibly for you. When in stock, it is the first place I go.
TL,DR - Quality tube at decent price, won't fall apart.
Have used several of these tubes both on dirty city streets and thorny desert roads with Conti 4000S tires with very few flats. Good air retention, durable stems, and great price. For training and commuting, they are tough to beat.