I have a 650b flip/flop wheel set surly hubs and velocity cliffhanger rims, I'm going to run tubeless with ultra dynamico cava robustos.
Wheels are on a bike! Originally a 26" canti brake cruiser, to 650b V brake killer. Super fun to ride on dirt cause you feel like you shouldn't be there with riding position and all, but it handles well. Updated Pedals, took off fenders, it is still a work in progress, but the wheels are on a bike which I'm proud of.