I've been using these tubes in Continental Gran Prix 4000 All Seasons, 4000S, and now 5000 tires for years. While they're not bombproof (what road tube is?), they provide a good balance of weight and puncture resistance, particularly when coupled with Conti tires. Available in a variety of stem lengths, they're my go-to road tube year round.
The 25-32 size is really handy because it covers the sizes most commonly used on road and gravel. The 60mm length is perfect for the slightly aero rims I have, no need to mess with extenders and moving valve cores.
The Continental Race Road Tubes do what they're supposed to - hold air. However, I wish that the length of the Presta valves were longer (48mm or so) for better rim clearance.
These tubes combined with Conti GP4000 or Gatorskin tires make for a very reliable, flat-free system. Don't lower your tire inflation pressures! Use the recommended maximum on the tire and you won't get flats, especially pinches. There is no low-pressure movement! You also don't have to fill your tires as often. These tubes hold air well enough to go several days - but no further. Check them with a gauge so you catch slow leaks.
This used to be my go to tube, NOT anymore. The last 3 tubes have all burst at the seams, litterally. All after being ridden for only a few days. Not sure if I got a bad batch but not worth trying these again.
I was buying these tires because I wanted a mix of durability and weight savings, and I didn't want to sacrifice ride time for extremely light tubes. Western Bikes Works had the ones I wanted in stock and gave me a great deal on them too. I have not had any flats with them while running them inside some Conti's GP4000's.
I would definitely recommend these to anyone looking for a good training tire that will endure some harsh road conditions in the Spring time when all the roads are about to clear off.
Ive been running continental tires for years and love them. Just got a new bike that requires valve stem extensions. To use extensions, the core needs to be removed. These tubes have removable valve cores. Now I need to fall in love with these tubes.