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.

The Gravel H tires are the first 45c tires I've had experience with so a big caveat in terms of a comparison to other 45c tires. I chose this one for a durable and long lasting do-it-all and so far it fits the role.

Grip is good and handling is more than adequate. A little slippery on slick wet mud as expected. On dry bumpy terrain it excels in smoothing out the edges of the rocks.

It is a heavy tire, no getting around this. I noticed this as coming from 35 and 38c tires, these take more effort to spin up.

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.