When they say "removable valve core" they mean "core outer gage of the exact same thread and diameter as the valve stem". have not managed to refill them without disconnecting the valve core and causing a decompression (sometimes with the fun side effect of shooting the damn core out) once, either with a threaded pump or even just unscrewing the valve cap. incredibly frustrating to use, regardless of tube quality.
Continental provides a repeatable good experience with their high quality products. I'm sure there is lighter or cheaper tubes available. I'm also sure I want a good product for a good price. That said, I don't have to think twice about purchasing these tubes. As a "normal guy" rider they'll do everything I need them to do. Biketiresdirect provides quick delivery and great price. I'll continue to use this product and will purchase them from Biketiresdirect.
The Continental Road Race tubes are a high quality product for road cycling both training and racing. I use them with my Continental Grand Prix 4000 S II tires. One of the best things about the tubes is that they come in a variety of stem lengths. I have two sets of deep rim carbon fiber wheels on my road bikes and being able to get the longer stem is a key feature of this product. The tubes are long lasting and are great when paired with almost any wheel tire combination you have. Highly recommended.
Waited about 2 months for these to return to stock since I like these tubes. I use these on a Seven tandem with 700x28 tires and find that running a slightly larger tube in the 28mm tire gives excellent performance. I do not like to over over inflate a smaller diameter tube. Of course, I coat the outside of the tube with talcum powder and always powder the inside of the tire. I find that this gives extra slip when inflating the tube and prevents creases or folds that can cause an air leak or a heavy spot on the tire.
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've been using the Continental brand for years...Normally nothing wrong with them... I usually only have problems with innertubes when there's a tire problem..ie puncture, something imbedded in the rubber or a hole in the tire that causes the innertube to protrude and pop. I have to use a 60 mm valve stem so the expense is more but I stock up when I catch them on sale.
These are good tubes. I've run them exclusively for the past two years. No blowouts. Precious few flats. When I first started using them I thought roughly 1 in 4 were defective since 25% had a very slow leak. What I figured out is the valve assembly is not always fully tightened into the stem. Check each one before you mount it with a small adjustable wrench. Do not over tighten.. Assuming it's tight, tube is great.
I use these on my road bike with gatorskins tires,have not had bad experience with them. valves are strong don't break . value rating is 3 because everything is too expensive.
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.
It's simply the best butyl tube I can find. The ride quality isn't as good as latex but far better than a standard tube. They hold air much better than latex over time as well. If you cannot or won't run latex tubes I find this to be the very next best option. My 2nd favorite in use daily tube.
I use this with road bikes mostly 28mm tires (conti GP5000 and panaracer GravelKing)and one 1 1/4 tire (panaracer pasela). These tubes are super. Easy to install, great quality and good balance of weight and puncture resistance. Just did the Cino ride with no flats