I ride my bike daily and have had my share of flat tires, from road debris, failed valve stems, goatheads, and several other causes. This is even with heavy duty inner tubes and tire liners. I carry a compact tool kit and an extra inner tube, but it is always a big inconvenience to get a flat tire, especially if I am far enough from home that I have to fix it on the road rather than push the bike home. So I ordered these tubes for my daily commuter bike so that I would never have to fix a flat again, at least on this bike. I read a great many reviews on these and other tubes, and I watched video reviews on Amazon as well as other web sites. I found the video review here on Amazon, for the yellow version of this same tire, to be the most helpful. So I knew these would probably be difficult to install, but I thought I could do it, and the extra work would be worth it, to never get another flat tire. My bike has 700c tires, and I have two sets of tires, 700 x 38, and 700 x 40. So I ordered these orange tubes in 700 x 38. The tires arrived and they are a few centimeters larger than the rims, as some other reviewers pictures show. This was ok, these are the correct size. The first thing I tried was to install these with the 700 x 38 tires. No way, no how was this ever going to work. I’m a little stubborn and I tried for about an hour. I used several different methods that I had seen in the videos. I used zip ties, screwdrivers, and a lot of force. The 700 x 38 tires were just too small for these 700 x 38 tubes. So I took those off and used my 700 x 40 tires, and these were perfect. I put the tire on first, with one side open, then tucked in the tube, then used a few zip ties and two small flathead screwdrivers to seat the tube in on this side. Using this method with the larger tire, the first tire tire took me about 30 minutes, and then having done that tire, the second took about 20 minutes. The tires were tight and firm, and it was then easy to mount the finished tires on my bike. The tires are heavier, as expected, than tires with air-filled inner tubes. Then I went riding. The bike is now slightly more work to peddle, but this is not really a problem. If I gear down by one gear, the work of peddling is the same. I have a heavy steel framed bike anyway, and these are not racing tires. I just get a little bit better of a workout if I want to peddle fast with these tires. I found the ride smooth and comfortable, and the bike corners fine at the medium speed that I ride. Overall, the installation work is worth it to me. These are good for anyone with the same issues that I have and not wanting to have to fix flats, but they are a challenge to install and I would have been really frustrated if I didn’t have the correct tire size on hand. Now that all the work is behind me, I’m glad to have these.