X-LAB RT9 Dura-Ace Di2

The RT9 redefines what is possible in lightweight performance engineering. Constructed from Toray T1100 carbon and refined through extensive structural analysis, the frame weighs an astonishing 550 grams while maintaining the stiffness and durability required for elite racing. The result is a machine built for the purest expression of climbing performance — with instant acceleration, unmatched efficiency, and effortless elevation gain. The X-Lab RT9 is the lightest production road bike frame in the world.

When the goal is pure elevation, grams matter. The RT9 begins with a frame engineered to approximately 550 grams, built to feel weightless on the steepest pitches while staying composed under real-world power. Every touchpoint is designed for climbing: a lightweight, responsive integrated cockpit that keeps the front end precise when the road turns vertical and the pace turns personal. From seatpost to tube junctions, the RT9's integration is obsessively refined — cleaner lines, cleaner airflow, and a ride that feels like perpetual poetry in motion.

• 550g Toray T-1100 carbon frame — the world's lightest production road bike frame
• Full Shimano Dura-Ace Di2 12-speed wireless electronic groupset
• Branta C50 ULR carbon wheelset with carbon spokes and ceramic bearings (1,230g)
• Branta carbon power meter crankset with integrated Apple Find My anti-theft
• Seamlessly integrated carbon cockpit, UDH compatible dropout