The lightest production road frame ever built. X-LAB RT9 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 RT9 is the lightest production road bike frame in the world. Period. The 550g Frame to Defy Gravity When the goal is pure elevation, grams matter. The RT9 begins with a frame engineered to ~550 grams, built to feel weightless on the steepest pitches while staying composed under real-world power. A Cockpit Built for Switchbacks 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. Seamless Integration, Elite Efficiency From seatpost to tube junctions, RT9’s integration is obsessively refined to complement an all-out climbing machine with cleaner lines, cleaner airflow, and a ride that feels like perpetual poetry in motion. Geometry Frame Size XS S M L XL A Seat Tube Length (mm) 470 495 515 540 565 B Top Tube Length (mm) 504 523 540 559 579 C Head Tube Length (mm) 105 118 130 148 171 D Seat Tube Angle (deg) 75 75 74 74 73 E Head Tube Angle (deg) 71 72 73 73 73 F Chainstay Length (mm) 410 410 410 410 410 G Wheelbase (mm) 970 978 982 992 1007 H Fork Rake/Offset (mm) 48 48 43 43 43 I BB Drop (mm) 72 72 70 70 70 J Stack (mm) 505 520 534 553 575 K Reach (mm) 371 379 387 395 405 L Front Center (mm) 575 582 583 592 607 Trail (mm) 67 63 64 61 59 Components Size XS S M L XL Stem 90 90 100 100 120 Handlebar 360 360 380 380 400 Seat Post 300 300 300 300 300
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