GT8

  • CARBON
  • GRAVEL
  • GRX Di2
  • POWER METER
  • TRAIL

Adventure-ready gravel bike built for control, comfort, and conquest.

$3,199 Free Ground Shipping

  • "Absolute dead-center of the current gravel consensus" - Velo
  • 55mm tire clearance
  • The adventurer's dream mount
  • Built-in power meter and downtube storage

or as low as $150/mo with

HSA/FSA eligible for qualified customers

Payment methods:

Select size See bicycle geometry

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Size Guide

Not sure what size you should ride? Visit one of our dealers in your area. Find A Dealer

Delivery within 14 days

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Size Chart

GT8

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"
XL 183 cm – 191 cm 6' 0" - 6' 3"
XXL 191 cm – 202 cm 6' 3" - 6' 7"

GT8 Free Ground Shipping

Afterburner Black Size: - Quantity: 1

$3,199
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X-LAB GT8

The GT8 is X-LAB’s first gravel platform, built for riders who see every road as an invitation.

Designed for stability, control, and long-distance comfort, the GT8 transitions effortlessly from pavement to dirt, city streets to open trails.

With confident handling and durable carbon construction, it’s a gravel bike that encourages exploration without limits.

Wherever the road disappears, the GT8 keeps going.

Where Gravel Gets Interesting

The GT8 is made for the rides that don’t follow a route. It was born to master uneven terrain, unknown turns, and long mixed-surface days where stability, speed, and confidence all matter at once.

Clearance That Changes the Ride

With up to 55mm tire clearance, the GT8 opens the door to bigger comfort, more grip, and more capability wrapped in colorways that look as fierce as they feel.

The Seat Stay Advantage

A unique seat stay design balances strength, compliance, and precision handling. The GT8 is built to maximize ride performance while staying true to modern gravel standards and race-ready intent.

Highlights GT8

  • Key Features

    Branta C45 Gravel carbon wheelset

    Shimano GRX 717 Di2 groupset

    Branta alloy crankset with integrated power meter and Apple Find My anti-theft technology

    In-frame storage and accessory mounting points on frame and fork

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    Branta C45 Gravel carbon wheelset

    Shimano GRX 717 Di2 groupset

    Branta alloy crankset with integrated power meter and Apple Find My anti-theft technology

    In-frame storage and accessory mounting points on frame and fork

  • Technical Specifications

    FRAME

    XDS Carbon Frame, Toray T-800, UDH Compatible

    FORK

    XDS Carbon Fork, Toray T-800, 100x12mm Thru-Axle

    STEM

    Branta Carbon Stem

    HANDLEBAR

    Branta Gravel Carbon Handlebar

    SEATPOST

    XDS Carbon 27.2mm

    REAR DERAILLEUR

    Shimano GRX RD-RX717 Di2

    SHIFTERS

    Shimano GRX ST-RX717 Di2

    BRAKES

    Shimano GRX BR-RX715

    CASSETTE

    Shimano CS-M6100-12, 10-51T

    CRANKSET

    Branta Alloy Power Meter Crankset, 40T, Narrow-wide Teeth,

    24mm Steel Spindle, Apple Find My Anti-Theft Technology

    BOTTOM BRACKET

    T47 24mm

    ROTORS

    Shimano SM-CL700, F:160mm R:160mm

    CHAIN

    Shimano CN-M6100

    WHEELSET

    Branta C45 Gravel Carbon Wheelset, Stainless Steel Spokes

    TIRES

    Continental Terra Trail 700x45C

    Max Tire Clearance: 55C

    SADDLE

    Fizik Terra Argo X7

    WEIGHT

    8.78 kg / 19.31 lbs (Size M)

    SIZE OPTIONS

    XS / S / M / L / XL / XXL

  • product geometry anchor

    Geometry & Dimensions

    Basic geometry
    title XS S M L XL XXL
    A — Seat Tube Length 435mm 447mm 471mm 491mm 532mm 577mm
    B — Top Tube Length 506mm 525mm 547mm 566mm 585mm 605mm
    C — Head Tube Length 80mm 100mm 120mm 140mm 165mm 190mm
    D — Seat Tube Angle 76° 75° 74° 74° 73° 73°
    E — Head Tube Angle 70° 70° 71° 71° 71° 71°
    F — Chainstay 435mm 435mm 435mm 435mm 435mm 435mm
    G — Wheelbase 1020mm 1032mm 1031mm 1046mm 1061mm 1078mm
    H — Bottom Bracket Drop 80mm 80mm 80mm 80mm 80mm 80mm
    I — Stack 519mm 540mm 565mm 584mm 607mm 631mm
    J — Reach 370mm 379mm 384mm 392mm 399mm 408mm
    K — Front Center 598mm 610mm 609mm 624mm 638mm 655mm
    O — Stand Over 715mm 730mm 755mm 773mm 807mm 838mm
    • A — Seat Tube Length 435mm
      B — Top Tube Length 506mm
      C — Head Tube Length 80mm
      D — Seat Tube Angle 76°
      E — Head Tube Angle 70°
      F — Chainstay 435mm
      G — Wheelbase 1020mm
      H — Bottom Bracket Drop 80mm
      I — Stack 519mm
      J — Reach 370mm
      K — Front Center 598mm
      O — Stand Over 715mm
    • A — Seat Tube Length 447mm
      B — Top Tube Length 525mm
      C — Head Tube Length 100mm
      D — Seat Tube Angle 75°
      E — Head Tube Angle 70°
      F — Chainstay 435mm
      G — Wheelbase 1032mm
      H — Bottom Bracket Drop 80mm
      I — Stack 540mm
      J — Reach 379mm
      K — Front Center 610mm
      O — Stand Over 730mm
    • A — Seat Tube Length 471mm
      B — Top Tube Length 547mm
      C — Head Tube Length 120mm
      D — Seat Tube Angle 74°
      E — Head Tube Angle 71°
      F — Chainstay 435mm
      G — Wheelbase 1031mm
      H — Bottom Bracket Drop 80mm
      I — Stack 565mm
      J — Reach 384mm
      K — Front Center 609mm
      O — Stand Over 755mm
    • A — Seat Tube Length 491mm
      B — Top Tube Length 566mm
      C — Head Tube Length 140mm
      D — Seat Tube Angle 74°
      E — Head Tube Angle 71°
      F — Chainstay 435mm
      G — Wheelbase 1046mm
      H — Bottom Bracket Drop 80mm
      I — Stack 584mm
      J — Reach 392mm
      K — Front Center 624mm
      O — Stand Over 773mm
    • A — Seat Tube Length 532mm
      B — Top Tube Length 585mm
      C — Head Tube Length 165mm
      D — Seat Tube Angle 73°
      E — Head Tube Angle 71°
      F — Chainstay 435mm
      G — Wheelbase 1061mm
      H — Bottom Bracket Drop 80mm
      I — Stack 607mm
      J — Reach 399mm
      K — Front Center 638mm
      O — Stand Over 807mm
    • A — Seat Tube Length 577mm
      B — Top Tube Length 605mm
      C — Head Tube Length 190mm
      D — Seat Tube Angle 73°
      E — Head Tube Angle 71°
      F — Chainstay 435mm
      G — Wheelbase 1078mm
      H — Bottom Bracket Drop 80mm
      I — Stack 631mm
      J — Reach 408mm
      K — Front Center 655mm
      O — Stand Over 838mm
    Component geometry
    title XS S M L XL XXL
    Fork Rake/Offset 55mm 55mm 50mm 50mm 50mm 50mm
    Trail 75mm 72mm 70mm 70mm 70mm 70mm
    Handlebar 370/430mm 370/430mm 390/450mm 390/450mm 410/470mm 410/470mm
    Stem 70mm 70mm 80mm 90mm 100mm 100mm
    Crankset 165mm 165mm 170mm 170mm 172.5mm 172.5mm
    Seat Post 300mm 300mm 350mm 350mm 350mm 350mm
    • Fork Rake/Offset 55mm
      Trail 75mm
      Handlebar 370/430mm
      Stem 70mm
      Crankset 165mm
      Seat Post 300mm
    • Fork Rake/Offset 55mm
      Trail 72mm
      Handlebar 370/430mm
      Stem 70mm
      Crankset 165mm
      Seat Post 300mm
    • Fork Rake/Offset 50mm
      Trail 70mm
      Handlebar 390/450mm
      Stem 80mm
      Crankset 170mm
      Seat Post 350mm
    • Fork Rake/Offset 50mm
      Trail 70mm
      Handlebar 390/450mm
      Stem 90mm
      Crankset 170mm
      Seat Post 350mm
    • Fork Rake/Offset 50mm
      Trail 70mm
      Handlebar 410/470mm
      Stem 100mm
      Crankset 172.5mm
      Seat Post 350mm
    • Fork Rake/Offset 50mm
      Trail 70mm
      Handlebar 410/470mm
      Stem 100mm
      Crankset 172.5mm
      Seat Post 350mm

  • FAQ

    General

    What rider type is the GT8 designed for?

    GT8 is designed to be a phenomenal do-it-all gravel bike. It can handle adventure rides, gravel racing, and short bikepacking trips. GT8 is a great option for any type of new or experienced gravel rider.

    Is the bike easy to assemble out of the box?

    Yes, GT8 is easy to assemble. You can refer to the written assembly guide or our assembly video to help guide you through the process. If you have any questions or doubts about assembling GT8 yourself, we recommend having it professionally assembled at your local bike shop.

    What’s the weight limit for the bike?

    GT8 has a weight limit of 242lbs (110kg), which includes the rider and any gear or cargo.

    Can the frameset be purchased separately?

    Yes, the GT8 frameset and other major components (including cockpit, crank, and wheels) are available for purchase.

    Does the bike have downtube storage?

    Yes, GT8 has an integrated storage compartment on the downtube of the frame. A storage bag that’s designed to be used in this frame storage compartment is also provided with GT8.

    Does the bike have additional mounting points for cargo or extra water?

    In addition to the standard water bottle mounting locations on the downtube and seat tube, GT8 also has mounting locations on the top tube, underside of the downtube, and both fork legs.

    Where can my bike be serviced and repaired?

    Any local bike shop will be able to provide general service for your GT8. For any component customization or warranty issues we recommend going to an X-LAB dealer to receive the best expert guidance and support.

    Technical

    Can the integrated power meter connect to third-party bike computers?

    Yes, the integrated power meter can connect to most major bike computers and fitness devices via ANT+. This allows live power data to be shared directly to your device. Live power data can also be shared via Bluetooth to the X-LAB Bikes app on your mobile device. At this time, live data can’t be shared to third party mobile apps via Bluetooth.

    Is the frame compatible with SRAM groupsets?

    Yes, the GT8 frame is compatible with most wired, wireless, or mechanical groupsets from all major drivetrain brands. GT8 comes with a 1x drivetrain, but is compatible with both 1x and 2x drivetrain options.

    What is the maximum tire clearance?

    GT8 has clearance for up to 55c tires.

    Does it use a UDH (Universal Derailleur Hanger)?

    Yes, GT8 uses a UDH.

    Is the 2-piece cockpit compatible with standard bike computer mounts?

    Yes, the 2-piece cockpit on GT8 is compatible with standard bike computer clamp mounts designed for round 31.8mm handlebars.

    What is the maximum chainring size supported?

    GT8 can fit up to 44T Shimano or 42T SRAM 1x front chainrings. For 2x, GT8 can fit up to 48-31T front chainrings.

    Are other cockpit size options available to purchase?

    Yes, X-LAB has 3 different stem options and 3 different handlebar options for GT8.

    Are other crank length options available?

    Yes, X-LAB offers numerous crank length options for the Branta alloy power meter crankset.

    Is the bike compatible with dropper seat posts?

    Yes, a standard dropper post can be installed and internally routed on GT8. GT8 has a standard 27.2mm round seat tube.

    Is the bike compatible with a suspension fork?

    Due to the impacts on geometry and handling, we don’t recommend installing a suspension fork on GT8.

    Does the power meter measure left, right, or both sides?

    The Branta power meter crank is dual-sided, meaning it measures power from both left and right legs separately.

    Is the wheelset tubeless ready?

    Yes - the rims and tires on GT8 are tubeless ready and tubeless rim tape is already installed. Tubeless valves and sealant must be purchased separately.

  • Manual Downloads

Media Reviews

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