ContinentalRace 28" 700x18-25c Bicycle Inner Tubes - 42mm Long Presta Valve - 4 PACK

Kept getting flats so i started looking for bulk tubes. Eventually i realized i kept getting flats not because of goat-heads, thorns, etc., but because many of the tubes themselves were defective. I kept getting tiny holes in the exact same place: opposite the valve steam. Checked the inside of the tire repeatedly, the rim, etc., but nothing there. Just manufacturing defects i have to assume. I've had a few that worked well, but at least half (after buying at least two four-packs) have not worked. Bummer.

After reading reviews from people that suspected the tubes were leakers, I inflated all of them to check. No leaks. People that had holes in the same place on all the tubes probably had a thorn in their tire that was never completely removed. The only way to get a blow out that I know of is installing a tire incorrectly. These are brand name continentals. I've been using them for years. There is nothing wrong with these at all. Great price!

Defective. Went through all 4 on a 100 mile ride. Hate to review negative but looking out for other riders here. Pin hole in the same spot on all 4.

Not compatible with Lyzene Pumps (which screw onto the valve). These tubes have a two part valve, with one end screwing into the other (and I'm not talking about the tip of the presta valve that presses in). If your pump screws onto the valve, as you go to remove the pump, it will take the outer half of the valve with it, which includes the presta closure and leaves the tube wide open. I was in disbelief when it first happened. I was able to take some pliers to remove the valve-end from my pump and then re-install it onto the tube-end half of the valve. It looks fine to use again, and does hold air, but it comes right off again with the pump. All four tubes have these ridiculously flawed presta valves. I unfortunately did not try out the tubes right after purchase and missed the window to return. Sorely disappointed

These "Continental" tubes are not Continental quality. Sure they have Continental stamped on them, but they're made in China and not Germany. Moreover they seem to have a consistent defect. I waited to post this review until I was sure the issue wasn't in the tire. Now I'm sure. I've used two of them so far and they both developed a hole near the same place opposite the valve stem. I know some will think that the issue could be debris stuck in the tire in that area. I know this because I thought the same thing. Nope. Checked and double-checked. It's the tubes. I've since read some other reviews that report the same thing I'm experiencing.I don't know if they're real Continental or knock-offs but they are poor quality and I would not buy these again.

My tubes just arrived and I'm a little skeptical based on what other reviewers have noted. I bought these in bulk knowing they wouldn't come in a box. However, I did expect to see a Continental stamp on the tube, but there wasn't. Unfortunately, these tubes will sit in my bike bag and the work bench until I have a flat. Sooo, unfortunately, I won't know for quite a while what kind of quality tube these are. Are these tubes that didn't pass inspection? I don't know. If you want to know for sure you bought Continental tubes, get them in a box and make sure you have stamped Continental tubes. I wrote Continental about the purchase and they have yet to respond.My two cents after 30 years of cycling and racing.

It's an innertube for a road bike, I doubt there's much I can tell you that you don't already know. I bought these to replace a worn out tube and to have a spare in my seat bag. I'm running my bike with 100-110 psi this tube hold air fine, I haven't had any issues with them. I like the long valve stem, that's nice. It's good to have a couple of spares but I haven't needed them yet.

The first one I mounted blew out with less than 80 pounds pressure. I hadn't even ridden it and I didn't use a tire tool to mount the tire. I have a pump with a hose that screws on to the valve stem. Every time I would try to unscrew the pump the valve inside the stem would come out.

These tubes compared to my previous ones are amazingly thick. That provides some comfort when riding at fast speeds downhill on a main street with cars in close proximity.

Came quickly, and good price.

Exactly what I was looking for and as described

it does what is say it is