I've ridden coast to coast across America on Schwalbe tires, and I recently purchased this specific width of tire for a rail-trail tour on the Blue River, Chief Standing Bear, Homestead and Mopac rail-trails in NE Kansas and SE Nebraska. We had heard that there might be goatheads on a section of these trails, so I wanted the best protection for worry-free riding. I had a fabulous six-day tour out and back on these trails and not a single puncture. The tires also handled a rainy, wet day on the trail with absolutely no problem - this width of tire cut into the top wet layer of crushed limestone with fabulous handling (while my touring partner's wider tires floated a bit on top, making his bike harder to handle). Fabulous worry-free tire that's perfect for touring on rail-trails.
The tire on the website says 45 mm but the actual size is 47 mm (622-47). This tire rides so well on smooth and loose surfaces with very little noise. I keep it at 40 psi for city riding, and when loaded down - 60 psi. It tracks well in loose gravel and sand, and sticks well on pavement in tight turns. The only niggle I have is an imbalance in the front tire. A very slight wump - wump on smooth pavement. I repositioned the tire on the wheel to no avail, thinking that it was a mounting error. My front wheel is 100% true, so it must be an overlap in plies. Other than that, this is a great tire. Well have to see how long it lasts.