RT9 Frameset

  • AERO
  • CARBON
  • RACING
  • ROAD

X-LAB’s ultralight climbing platform, built around a production carbon frame engineered to approximately 550 grams. Designed for riders who want elite stiffness, low weight, responsive handling, and a frameset ready for the highest-performance climbing builds.

$3,499 Free Shipping in the Contiguous U.S. Free shipping applies to delivery addresses within the contiguous 48 U.S. states only. Alaska, Hawaii, Puerto Rico, Guam, and other U.S. territories are excluded. Additional shipping charges may apply to excluded locations.

Free shipping applies to delivery addresses within the contiguous 48 U.S. states only. Alaska, Hawaii, Puerto Rico, Guam, and other U.S. territories are excluded. Additional shipping charges may apply to excluded locations.

Purchase Options

  • World’s lightest production carbon road frame
  • A WorldTour-proven climbing bike
  • Highest performing commercial carbon fiber
  • Platform of Velo's Everest Roam (June 2026)

or as low as $150/mo with

HSA/FSA eligible for qualified customers

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What's my size?

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  • background email XS
  • background email S
  • background email M
  • background email L

For the best experience, framesets are currently available only through our authorized dealers for professional assembly, setup, and ongoing service. Find A Dealer

Delivery within 14 days

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Size Chart

RT9 Frameset

Frame Size Rider Height
XS (46cm) 148 cm – 158 cm 4' 10" - 5' 2"
S (50cm) 158 cm – 168 cm 5' 2" - 5' 6"
M (54cm) 168 cm – 176 cm 5' 6" - 5' 9"
L (56cm) 176 cm – 183 cm 5' 9" - 6' 0"
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Sizing Guide

Sizing Guide

When purchasing a new bicycle, choosing the right size can do wonders for your ride experience. Use this sizing guide as a reference. If you’re in between two sizes, you can size up or down depending on your riding preference.

For the best results, we’d recommend visiting one of the many bike shops in our network to be fitted properly by a professional.

Your Measurements

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Size Recommendation

Based on your measurements, we recommend this frame size.

Best size for you: —

Your measurements: —

Best size for you: —

Based on your measurements, your recommended size is —. However, to ensure your comfort, safety, and the best riding experience, we recommend visiting an authorized X-LAB dealer to test ride both sizes before making your final decision.

Let’s Find Your Best Fit

Your measurements appear to fall outside our current size range for this bike. For your comfort, safety, and best riding experience, we recommend speaking with an authorized X-LAB dealer or contacting our support team before choosing a size.
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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.

Highlights RT9 Frameset

  • Technical Specifications

    FRAME

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

    FORK

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

    SEATPOST

    XDS Carbon Seatpost, 27.2mm

    WEIGHT

    1.14 kg / 2.51 lbs (Size M, w/o headsets)

    SIZE OPTIONS

    XS / S / M / L

    *Continuous Product Improvement

    Innovation never stands still. As part of our commitment to building the best possible bicycles, X-LAB reserves the right to update specifications, components, colors, and other product details at any time without notice. We make every effort to keep our published specifications current, but minor variations may occur between production batches. Please contact your local X-LAB dealer or Customer Support if you would like to confirm the latest specifications before purchase.

  • 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

  • FAQ

    General

    What rider type is the RT9 designed for?

    RT9 is for the rider who values weight savings above all else and spends long days climbing mile after mile. They are an experienced rider who values having the best equipment and has to have the pinnacle of carbon technology and innovation.

    What’s the weight limit for the bike?

    RT9 has a weight limit of 220 lbs (100kg), which includes the rider and any gear or cargo.

    Can the frameset be purchased separately?

    Yes, the RT9 frameset and other major components (including cockpit, crank, and wheels) are available for purchase.

    Where can my bike be serviced and repaired?

    Any local bike shop will be able to provide general service for your RT9. For any component customization or warranty issues, we recommend going to an X-LAB dealer to receive the best expert guidance and support.

    Technical

    What is the maximum tire clearance?

    RT9 has clearance for up to 30 mm tires.

    Is the frame compatible with SRAM groupsets?

    Yes, the RT9 frame is compatible with most wired and wireless electronic groupsets from all major drivetrain brands.

    Does it use a UDH (Universal Derailleur Hanger)?

    Yes, RT9 uses a UDH.

    What is the maximum chainring size supported?

    RT9 can fit up to 55-42T 2x front chainrings or a 68T 1x front chainring.

    What cockpit size options are available to purchase?

    X-LAB offers 3 different size options for the integrated aero cockpit on RT9.

    Additionally, you can use aftermarket cockpits from brands like FSA/Vision with their ACR Cone Spacer available here.

Support, Built Around Your Ride

From first setup to long-term service, X-LAB is designed to keep you riding with confidence.

Local Service Network

Get support through 200+ (and rapidly growing) X-LAB local bike shops for maintenance, service, fit guidance, and post-purchase care. Service parts are stocked and shipped from our California warehouse.

Lifetime Frame & Wheel Warranty

Ride with long-term confidence. X-LAB frames and Branta carbon-rim wheels are backed by lifetime warranty coverage.

Ready-to-Ride Accessories Included

Every bike comes with essential accessories, including torque wrench, taillight, and pump—so you can get rolling right away.

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