Nice! I recognize the Schwalbe Marathon Supreme tread.

I got a lot of mileage out of some contis (country ride I think) that I got for $5 ea used. When they wore through, I decided to take everybody else's enthusiastic recommendation and lay out the long green for the Supremes. I got 700x50 for my CrossCheck, and they seem great. Super comfy, that's for sure. No flats yet, I'm nearing 1000mi and the front tire is just now shedding the last of its central molding ridge.