Currently running Clements 40mm on Stan's rims on a Giant TCX. But, my old man legs want something that spins easier for the 200 miles of Dirty Kanza. I'm considering ordering 32mm Continental Gatorskin Hardshells. They have a protective layer from bead to bead and a kevlar belt under the tread. Also, thinking of running them on Zipp 101's Am I crazy???
I've done two 100mile Gravel Events on a titanium hard tail MTB and doing the DK200 next. I'm running a 29er wheelset with Light-Bicycle 30" wide carbons and WTB Nano 40 race set up tubeless. A somewhat knobby tire. I am not confident with a too narrow a tire and large gravel. With a MTB background I like the feeling of stability when rolling fast. The one thing I would concentrate on is gearing. I've used both a 46t and 48t chainring and am going back to a 46t for DK200. The proper gearing is vital to the ability of tired legs to work. I'm 55 so I know about tired legs.
Keep in mind that this years DK course will traverse more private land than in previous versions. I'm preparing for a much rougher ride on these roads if they're anything like the private roads that were used last year. I'll be running a 40c tire again this year.
