The Midnight Special is a road plus compatible frame, designed to provide comfort and speed on those all-day rides that extend well beyond fresh pavement. It excels on pot-holed, deteriorating pavement and the occasional long stretch of gravel. The Midnight Special matches perfectly with 650b road plus tires, ready to eat up road chatter and absorb all the bumps in the road for a much more comfortable ride. 100% Surly 4130 CroMoly frame, main triangle is double-butted; 1-1/8" threadless CroMoly fork Rack, fender, and three sets of water bottle mounts Flat-Mount disc brakes 44mm head tube Tire Clearance: 27.5x2.35" (w/o fenders), 700c x 42mm (w/o fenders), 650b x 50 (w/ fenders), 700c x 38mm (w/ fenders)