RT9

The lightest production road frame ever built.

$9,150 Free Ground Shipping

or as low as $150/mo with

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Size Guide

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Size Chart

RT9

Frame Size Rider Height
XS 148 cm – 158 cm 4' 10" - 5' 2"
S 158 cm – 168 cm 5' 2" - 5' 6"
M 168 cm – 176 cm 5' 6" - 5' 9"
L 176 cm – 183 cm 5' 9" - 6' 0"

RT9 Free Ground Shipping

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$9,150
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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.

Highlights RT9

  • Key Features

    Branta C50 ULR carbon wheelset with carbon spokes | 1,230 g

    Branta carbon crankset with integrated power meter + Apple Find My anti-theft technology

    Shimano Dura-Ace groupset

    XDS carbon frameset with Toray T1100, Full bike 6.2kg

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    Branta C50 ULR carbon wheelset with carbon spokes | 1,230 g

    Branta carbon crankset with integrated power meter + Apple Find My anti-theft technology

    Shimano Dura-Ace groupset

    XDS carbon frameset with Toray T1100, Full bike 6.2kg

  • Technical Specifications

    FRAME

    XDS Carbon Frame, Toray T-1100 + M40X, UDH Compatible

    FORK

    XDS Carbon Fork, Toray T-1100, 100x12mm Thru-axle

    HANDLEBAR / STEM

    Branta Carbon Integrated

    SEATPOST

    XDS Carbon Seatpost, 27.2mm

    REAR DERAILLEUR

    Shimano Dura-Ace RD-R9250 Di2

    FRONT DERAILLEUR

    Shimano Dura-Ace FD-R9250 Di2

    SHIFTERS

    Shimano Dura-Ace ST-R9270 Di2

    BRAKES

    Shimano Dura-Ace BR-R9270

    CASSETTE

    Shimano Dura-Ace CS-R9200, 11-34T

    CRANKSET

    Branta Carbon Power Meter Crankset, 52-36T,

    29mm Alloy Spindle, Apply Find My Anti-Theft Technology

    BOTTOM BRACKET

    BSA 29mm

    ROTORS

    Shimano SM-MT900, F:160mm R:140mm

    CHAIN

    Shimano CN-M9100

    WHEELSET

    Branta C50 ULR, Carbon Rims & Spokes

    TIRES

    Michelin Pro 5 700x28C

    SADDLE

    Selle Italia SLR Boost, Carbon Rails

    WEIGHT

    6.20 kg / 13.64 lbs (Size L)

    SIZE OPTIONS

    XS / S / M / L

  • product geometry anchor

    Geometry & Dimensions

    Basic geometry
    title XS S M L
    A — Seat Tube Length 430mm 460mm 480mm 500mm
    B — Top Tube Length 498mm 520mm 540mm 563mm
    C — Head Tube Length 110mm 120mm 137mm 157mm
    D — Seat Tube Angle 75° 74.2° 74° 73.5°
    E — Head Tube Angle 70.5° 71.7° 73° 73.5°
    F — Chainstay 410mm 410mm 410mm 410mm
    G — Wheelbase 972.5mm 977mm 978mm 992mm
    H — Bottom Bracket Drop 74mm 74mm 72mm 72mm
    I — Stack 510mm 525mm 543mm 567mm
    J — Reach 362mm 372mm 384mm 396mm
    K — Front Center 574mm 578mm 578mm 592mm
    O — Stand Over 704mm 728mm 750mm 769mm
    • A — Seat Tube Length 430mm
      B — Top Tube Length 498mm
      C — Head Tube Length 110mm
      D — Seat Tube Angle 75°
      E — Head Tube Angle 70.5°
      F — Chainstay 410mm
      G — Wheelbase 972.5mm
      H — Bottom Bracket Drop 74mm
      I — Stack 510mm
      J — Reach 362mm
      K — Front Center 574mm
      O — Stand Over 704mm
    • A — Seat Tube Length 460mm
      B — Top Tube Length 520mm
      C — Head Tube Length 120mm
      D — Seat Tube Angle 74.2°
      E — Head Tube Angle 71.7°
      F — Chainstay 410mm
      G — Wheelbase 977mm
      H — Bottom Bracket Drop 74mm
      I — Stack 525mm
      J — Reach 372mm
      K — Front Center 578mm
      O — Stand Over 728mm
    • A — Seat Tube Length 480mm
      B — Top Tube Length 540mm
      C — Head Tube Length 137mm
      D — Seat Tube Angle 74°
      E — Head Tube Angle 73°
      F — Chainstay 410mm
      G — Wheelbase 978mm
      H — Bottom Bracket Drop 72mm
      I — Stack 543mm
      J — Reach 384mm
      K — Front Center 578mm
      O — Stand Over 750mm
    • A — Seat Tube Length 500mm
      B — Top Tube Length 563mm
      C — Head Tube Length 157mm
      D — Seat Tube Angle 73.5°
      E — Head Tube Angle 73.5°
      F — Chainstay 410mm
      G — Wheelbase 992mm
      H — Bottom Bracket Drop 72mm
      I — Stack 567mm
      J — Reach 396mm
      K — Front Center 592mm
      O — Stand Over 769mm
    Component geometry
    title XS S M L
    Fork Rake/Offset 50mm 50mm 44mm 44mm
    Trail 68mm 61mm 59mm 56mm
    Handlebar 360mm 360mm 380mm 400mm
    Stem 80mm 100mm 100mm 120mm
    Crankset 160mm 160mm 165mm 165mm
    Seat Post 300mm 300mm 350mm 350mm
    • Fork Rake/Offset 50mm
      Trail 68mm
      Handlebar 360mm
      Stem 80mm
      Crankset 160mm
      Seat Post 300mm
    • Fork Rake/Offset 50mm
      Trail 61mm
      Handlebar 360mm
      Stem 100mm
      Crankset 160mm
      Seat Post 300mm
    • Fork Rake/Offset 44mm
      Trail 59mm
      Handlebar 380mm
      Stem 100mm
      Crankset 165mm
      Seat Post 350mm
    • Fork Rake/Offset 44mm
      Trail 56mm
      Handlebar 400mm
      Stem 120mm
      Crankset 165mm
      Seat Post 350mm

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