Pirelli

Lightweight, holds air better than latex and probably as good as or better than butylene even. Smaller and thus fits easier in my mobile repair kit. Tires roll good and the ride is pretty good too if you don't inflate too high of a PSI. I ride at about 80psi. I have gotten 2000 plus miles on previous purchases. A little painful if you get a flat because of the extra costs. A little alarming is the marketing picture which in image number one shows a version that is obviously by proportion not a 60mm valve stem. Specs different from the picture so hoping my latest purchase will still be 60mm. With the 60mm valve I am able to use them in my 51mm aero wheels. Happy customer.

I ride 4 to 6 thousand miles a year and value durability and puncture resistance. I have about a thousand miles on these now and they're solid. They definitely don't feel slow, and I have not experienced a flat. Some reviewers have mentioned that they are easy to mount, but I didn't find them especially so. I'd say they were no better or worse to mount than other recent tires I've used. I will likely purchase these again when they wear out.

I didn't buy a 40mm endurance tire expecting them to be fast but these things are brutally slower than the Conti All Seasons I traded them for. Only inflated up to about 38mm so for only an extra 3mm and all that extra rolling resistance and weight, I think going back to 35 All Seasons may be in my future. That said, these things might go great on my fully commuter rig if I want a slick for the city since they feel bomb proof and can't be much slower than the Cinturato M knobbies I have on it now.

I purchased these tubes based on articles I've read on reducing tube/tire weight to improve bike performance and a good GCN episode on YouTube. As this is the first time I've installed TPU tubes I induced small leaks during installation. I ordered a repair kit and closely following the instructions I got a good seal and have had no problem with the tube since I go it reinstalled. I have put at least 500 miles on the new tires (Conti GP5000S TR) and tubes and have noticed significant performance improvement especially going down hill. My heavier friends no longer pass me going down hills which I attribute to the improved aerodynamics and rolling performance. These tubes definitely contribute to this improvement and I would buy them again.