Same. Looking for spies/answers. I just spotted this bike/frame. And it might be the ticket to replace my current Vitus alloy frame as an all-road do anything dropbar bike. I did get the answer from Vitus that it clears 650b x 47 with 6mm of mud clearance. Which should mean I can clear 650b x 2.1" with 3mm clearance if not riding in mud. I'll plan to run everything 700x28c, 700x40c, and 650bx2.1" depending on the setup I need.