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.
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.
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.
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.
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.
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.