Schwalbe

Size 42-622 was easy to mount - no tools, no blisters, beads popped into place at 20 psi. After a day the case measured 44 mm wide and 40 mm high on 30 mm (inside) rims at the recommended minimum 50 psi. Width should be right at 42 mm on 25 mm rims. On narrower rims the tread might be wider than the case.

The tread resembles the Marathon Almotion but is deeper, about 2.5 mm. Handling on pavement is fine, the blocks are wide enough to avoid squirm. The profile is more flat than round so it might feel different at large lean angles (which I didn't try). Grip is good, I experienced no slipping while climbing on wet pavement or hard dirt. With a 200 lb load the tires dug into deep gravel and deep, soft dirt rather than floating on top. A bigger size or lower pressure might have helped. On very smooth pavement the tread pattern is quiet at low speeds but produces an audible howl as you speed up. That peaks around 12 to 15 mph then diminishes at higher speeds and gets buried in wind and other noises.

The sidewalls are thicker and stiffer than the Marathon Almotion or Michelin Power Adventure but ride comfort is better than I expected. At 50 psi the feeling is firm but not harsh. I can't measure rolling resistance accurately but the tires maintained speed as well as most on a section where I coast. My road tires (40 mm Pirelli P-Zero inflated to 40 psi) are of course more supple and faster but the difference isn't dramatic.

Overall I'd say the Mondial Pro is probably more durable and better off road than lighter tires like the Marathon Almotion or Michelin Power Adventure. It's lighter, more supple, and uses newer technology than the classic Marathon (which I haven't ridden) or the Continental Top Contact II (which I have). For pure pavement the Marathon Efficiency might be better.

I purchased the Nobby Nic to serve as a front tire. I had originally went with Racing Ralphs but found they weren't providing the grip and traction I wanted. I ended up using this as a front tire and couldn't be happier. It's a little slow on pavement but loose-over-hard grip is great.

These tires roll faster than I thought(they felt like a road tire even though they are 45mm). They literally felt like a slick with the protection of a touring tire.

I averaged 16 mph on the flats while carrying a fully loaded bike.

I used them for my gravel bike on a multi day bike tour and I absolutely love them.

The puncture protection is better than I thought, the sidewall protection is phenomenal, I had zero punctures.

I used them on all types of surfaces; from gravel, sand, small rocks, paved streets to unpaved roads, the tires absorbed all sorts of uneven surfaces you can imagine.

They are totally worth the money.

Looks great once mounted, but they are DIFFICULT to mount like the Conti GP5K's. You need two

Challenge tire levers and a soapy sponge. Once mounted (finally) to get the bead to seat, use soap

around the rim walls AND a high pressure tubeless tire inflator at 180 PSI. This forces the beads to seat!

You may need to deflate, reapply soapy water on the tire rims again, and they WILL seat!

I'm running these tubeless, they hold air for weeks, very happy so far. The ride is not as supple as the Conti GP5K or the Vittoria's though. I bought them on impulse, so far about 100 miles. I'm using Challenge tubeless fluid, which works well with the Conti's, Challenge and Schwalbe tubeless tires.

Good Luck!