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

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.

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.

Good tubes. High quality and a good value for the price. The stem is high quality and doesn't bend easily like other brands. This is important to me if i need to fix a flat on a ride with a little hand pump. After reading some of the lower ratings for this product, I think there are a lot of people out there who do not know how to properly install a tube on a road tire or understand the importance of inflating to an appropriate pressure. The pressure rating on your tire isn't just a suggestion. If you under inflate you run the risk of getting a pinch flat eventually. If you pinch and pull the heck out of the tube or stem of the tube getting it in you probably gave yourself a flat before you even finished fixing the last one. watch a couple YouTube videos and read a bike maintenance guide, attend a clinic, or have an experienced cyclist teach you how.

I had to replace a flat several weeks ago, so I used this tube. Since then, I have placed maybe 350-400 miles on it, and so far I have had no problems. I put my road bike under some abuse (potholes, broken glass, rocks, etc.) and so far, so good. Note that I check my tire pressure before EVERY ride and make sure it's 95-105 PSI. Also make sure that the threaded washer is screwed on tight against your bike's rim, so when you're trying to inflate the tube, you don't accidentally jerk or push the valve stem into the tube.The only thing that surprised me was that the valve stem is in two parts... one part of the threaded tube connects to the tube itself (as you'd expect) and there's a second threaded tube that slides into the first tube I just mentioned. Sometimes, when unscrewing the black dust cap, you can accidentally unscrew this secondary tube, and totally deflate the tire. As long as you avoid doing that, you're good.These tubes have worked extremely well for me so far.