I bought these tubes to use in my first triathlon. They arrived the day before the race. I installed them, but one of the tubes would not hold air. I discovered a tiny hole in that brand new tube. I left the other tube installed, but the next morning I noticed the tire was flat. After removal, I found a 1 inch long split in the rubber. Fortunately, there was enough time to install standard weight Kenda tubes prior to my race. I e-mailed Western Bike Works (WBW) the next day to notify them of the faulty tubes. They gave me a prompt refund of the cost of the tubes, so kudos to WBW. Excellent customer service!
A quality light-weight tube. Does what it should. Not stupid expensive.
The only potential negatives to me are the price and the box size. The Vittoria tube is very similar, cheaper, and comes in a small enough package to fit in your jersey pocket.
Paired these tubes with 700x23mm Conti 4000s tires, the combination is mounted on HED Ardennes FR clinchers and I'm a happy man. Great ride, good road feel, finishing the rides feeling fresh and so far No flats! I would recommend this set up to a friend.
After ordering these tubes I did lots of reading about how lightweight race tubes are horribly unreliable & require daily inflation. Nothing could be more untrue about these contis I got them as a set with Ultra Sport II Folding tires & I ride every day. The rim has bottoms out sometimes twice a day, and I dread a pinch flat each time it happens, but so far the tubes have held up lovely. I've begun stocking up on tubes & conti tires bc I think they have the best product & reputation in the sector.
Tubeless! Disc! Aero! Blah, blah blah. Cyclists should wear wool shorts (BLACK), a jersey with a single sponsor, a cycling cap, and ride a Columbus-steel bike with a set of Continental Grand Prix and Conti tubes around Mavic hoops with 32 spokes. It's how things are supposed to be - not all this newfangled shiny plastic trash.
Even if you have succumbed to the lure of the modern, grab these - they'll last, they'll fill with air, and the spare will fold nicely into your jersey pocket.