Bastion Road Disc: With complete builds as light as 6.5 kg, the Bastion Road Disc represents one of the lightest bikes in its class. The torsional stiffness and stability of Carbon Fibre. The ride comfort of Titanium. Disc brakes. Electronic Shifting. Internal routing. Hidden control boxes. Tyre clearance up to 700c-28. Completely custom geometry. 3 stiffness options. Semi-standard and custom paint.