Continental 42mm Presta Valve Tube

My rating of this product reflects my opinion of these tubes when purchased in new condition. Although the rating is positive, this review is meant as a warning to others that you might, or might not, get a great deal buying from Amazon Warehouse.So far, I've bought 4 of these tubes from Amazon Warehouse. The price is GREAT. I paid around two dollars each.I bought two each of "Condition: Used - Like New" and "Condition: Used - Very Good". The latter were described in detail as, "Minor cosmetic imperfections on the corner of the item. Item will come in original packaging. Packaging will be damaged." The "Condition: Used - Like New" were both exactly that: They looked and performed like new.No, I don't pinch my tubes when installing them. But somebody shopping on (and returning to) Amazon does. The two "Condition: Used - Very Good" tubes were both popped in the same place, where the N00Bs so often pop their tubes.Obviously, Amazon Warehouse doesn't attempt to inflate returned tubes. And the visual inspection skills at Amazon Warehouse aren't perfect. One of the holes made when N00B pinched his (Yes, I am certain. Any lady would have followed instructions.) tube was so large it created a flap of butyl.

decent tube. it holds air

Have used before and now again. No problems with tubes either time.

This is my comparison of the Continental Race 28 (42mm) and the Michelin Airstop A1 (52mm) both in 18-25 sizeBoth are nice products with actual confirmed weights of 97g, which are not the lightest but certainly not the heaviest on the market. According to my weigh-in, the Continental Race 28 comes in at 98g including the threaded ring (which weighs 1g) so all being equal they are the same weight (unless you're a total weight weenie)Michelin Airstop: Nice tire with non-removable valve cores and a smooth copper stem. The valve stem lengths are either 40mm or 52mm. Unfortunately the 40's get through a standard aero wheel (Mavic cosmic) but are still slightly short and the 52's are a bit on the long side, so I opted for the 52s (which came in at the same weight as conti's 42s). Seems that the physical tube is a bit snugger fitting in the tire around the valve stem than the continentals but overall no issue installing. Tire is also coated for easy installation.Continental Race 28: Removable core and threaded silver stem which, to me is a bit concerning as the cores frequently come out when unscrewing the pump (as many have pointed out) and despite locking them in tightly with a wrench, is less than mentally comforting when changing a flat on the side of the road. Valve stems are a nice length at 42mm for standard aero wheels and also comes in a 60mm which is a touch too long for standard aero wheels. Tire is not coated but installs easily.Overall they are both very nice tires with the primary difference being the valve stem. If you want a solid non-removeable core, go for the Michelin if you prefer removable threaded go for the Conti. Can't lose with either as both are reputable brands and the physical tires are nice in either case.

It’s been hard trying to find these in the stores so I bought some on here. I was a little skeptical with some of the bad reviews….Here’s what happened. After I installed the new tube, got it all aired up and then took my dog for her bike/run. Great, the first day, all seemed well. The next night, I went to go for another ride and the tube/tire was flat! I decided just to air it up again and make sure I tightened the valve when done. It has now lasted weeks so far without having to air it up again.Check those valves after you install/air them up! I believe that was my problem.

Replaced a tube with a flat. Right sized valve height for my Felt road bike. These tubes are no longer seamless, but the quality still appears to be good. Road miles will tell.

I've been using these tubes for about 2 years now and haven't had any issues with defects. All of the flats that I've had on my road bike have been from something puncturing the tire and tube. There are lighter tubes out there but these are a good mix of light + durable. The 42mm valve stem is fine for my Campagnolo Zonda wheels. These tubes have a valve stem nut that's great when installing the tube to keep it in place.

I bought two of these for my Schwinn road bike (700x25c wheels). I had been having problems with my rim tape, so I finally got that resolved. When I mounted these tubes and started inflating them, there were no pinches or twists in the tube or between the tube and tire, but the tube was not inflating evenly. I continued pumping until the tire was firm and consistent (I rolled it around on the bike a bit to level it out and set the tire bead in place before going past 20 psi) everything pumped up and seemed fine with the first one (on my front tire) and I set out for a ride with my rear tire pumped to about 90 psi (this was a bell tube I got from walmart) and the front was around 80 psi. The front tire wore flat within 5 miles. When I pulled it out I noticed that there was a ring opposite the valve stem. When properly inflated, the tube had a low spot because of the extra reinforcement around the valve stem area, causing the tube to bulge and rub against itself causing the flat. I noticed this on the other continental tube I had purchased and took it for a shorter ride and used lower pressure, hoping that would resolve the issue. At 50 psi, (keeping in mind the tires are rated for about 110 psi) the tube rubbed itself through in 1.7 miles.I will not be buying these tubes again. Perhaps if you have a mountain bike, their tubes are better at lower pressures, but the road bike tube that I used needed to be higher than 40 psi just to keep the tire from riding too low.You might also factor in that I'm a bigger guy at 230 lbs, but it was clear that the tube was either defective or poorly designed or marked.