X-LAB GT8 Carbon Gravel Frameset | Afterburner Black | XS–XXL

X-LAB GT8 Carbon Gravel Frameset | Afterburner Black

Build the GT8 exactly the way you want it.

The X-LAB GT8 Carbon Gravel Frameset gives riders the foundation of X-LAB's highly versatile GT8 without locking you into a predetermined drivetrain, wheelset, cockpit, or component package. Built from Toray T-800 carbon fiber, the GT8 combines modern gravel race performance with substantial tire clearance, integrated storage, adventure-ready mounting options, and geometry designed to remain capable when the route gets rough.

This is an excellent starting point for a custom gravel race bike, all-road machine, high-performance adventure build, or premium component transfer. With clearance for tires up to 55mm, the GT8 can be configured around fast gravel tires for racing or considerably larger rubber for technical gravel, rough roads, and long-distance riding.

The frame is UDH compatible and supports both 1x and 2x drivetrain configurations, giving builders considerable freedom when choosing Shimano, SRAM, mechanical, or electronic drivetrain components.

What's Included With This Frameset

• X-LAB GT8 Toray T-800 carbon frame
• X-LAB GT8 Toray T-800 carbon fork
• XDS 27.2mm carbon seatpost
• Headset bearings
• Front derailleur mount for compatible 2x drivetrain builds
• Brake mounting adapters supplied with the frameset
• Frame plug and routing accessories
• GT8-specific stem spacers for the internal cable routing system

What Is Not Included

This is a frameset, not a complete bicycle. Additional components are required before the bike can be ridden.

• Stem
• Handlebar
• Shifters
• Rear derailleur
• Front derailleur
• Crankset
• Bottom bracket
• Cassette
• Chain
• Brake calipers and controls
• Wheelset
• Tires
• Saddle
• Pedals
• Other drivetrain, cockpit, braking, and finishing components required for a complete build

Please do not assume that components shown on a complete GT8 bicycle are included with the frameset. The complete-bike specification and the frameset package are different products.

Key Features

• Toray T-800 carbon frame construction
• Matching Toray T-800 carbon fork
• Massive tire clearance up to 55mm
• Integrated downtube storage compartment
• Multiple accessory mounting points on the frame and fork
• UDH compatible rear derailleur interface
• Compatible with both 1x and 2x drivetrain configurations
• Internal cable and hose routing
• Internal routing capability for a compatible dropper post
• Standard 27.2mm round seatpost interface
• Designed for gravel racing, adventure riding, and rough-surface exploration
• Available from XS through XXL

55mm Tire Clearance Changes What a Gravel Bike Can Do

The GT8 offers clearance for tires up to 55C, giving builders an unusually broad range of setup possibilities. Run a lighter, faster gravel tire for racing and fast group rides, or move to a larger-volume tire when traction, comfort, and rough-terrain capability become the priority.

That versatility makes the GT8 particularly appealing to riders who don't want a gravel bike limited to one type of riding.

Internal Downtube Storage

An integrated storage compartment inside the downtube provides space for compact ride essentials without requiring an external saddle bag. It's an especially useful feature for carrying items such as a tube, tire repair supplies, inflator, or small tools while maintaining a clean bike setup.

Build It 1x or 2x

The GT8 is designed to support both 1x and 2x drivetrain configurations. The framesets offered by Go Grava include the appropriate front derailleur mount, making the platform suitable for riders who prefer a traditional double-chainring gravel drivetrain as well as those building a wide-range 1x system.

X-LAB specifies maximum front chainring compatibility of up to 44T for Shimano 1x, 42T for SRAM 1x, and up to 48/31T for 2x configurations.

UDH Compatible

The GT8 uses the SRAM Universal Derailleur Hanger (UDH) standard. In addition to making replacement hangers easier to source, UDH compatibility gives builders access to a broad range of modern drivetrain configurations.

Technical Specifications

• Brand: X-LAB
• Model: GT8 Frameset
• Category: Carbon Gravel Frameset
• Color: Afterburner Black
• Frame Material: Toray T-800 Carbon
• Fork Material: Toray T-800 Carbon
• Fork Axle Standard: 100x12mm Thru-Axle
• Derailleur Hanger: SRAM UDH Compatible
• Seatpost: XDS Carbon, 27.2mm
• Maximum Tire Clearance: Up to 55C
• Drivetrain Compatibility: 1x or 2x
• Maximum Shimano 1x Chainring: 44T
• Maximum SRAM 1x Chainring: 42T
• Maximum 2x Chainrings: 48/31T
• Dropper Compatibility: Yes, internally routed 27.2mm compatible dropper
• Frame Storage: Integrated Downtube Storage
• Frameset Weight: Approximately 1.78 kg / 3.92 lb in size M without headset
• Available Sizes: XS, S, M, L, XL, XXL

Size Guide

• XS / 46cm: Approximately 4'10"–5'2" / 148–158cm
• S / 50cm: Approximately 5'2"–5'6" / 158–168cm
• M / 54cm: Approximately 5'6"–5'9" / 168–176cm
• L / 56cm: Approximately 5'9"–6'0" / 176–183cm
• XL / 58cm: Approximately 6'0"–6'3" / 183–191cm
• XXL / 62cm: Approximately 6'3"–6'7" / 191–202cm

Manufacturer sizing is intended as a starting point. Rider proportions, flexibility, intended riding position, stem length, handlebar reach, and individual fit preferences can affect the ideal frame size. Professional sizing assistance is recommended when between sizes.

Ideal For

• Custom gravel bike builds
• Gravel racing
• Fast all-road riding
• Long-distance gravel events
• Adventure riding
• Bikepacking-oriented builds
• Riders transferring a premium groupset and wheels to a new chassis
• Riders who want to choose every component instead of buying a stock build

Why Build a GT8 Frameset?

• Start with the same carbon platform used by the complete X-LAB GT8
• Choose your own Shimano or SRAM drivetrain configuration
• Select your preferred crank length and gearing
• Build around the exact wheel and tire combination you want
• Customize cockpit dimensions for your individual fit
• Take advantage of unusually generous 55mm gravel tire clearance
• Maintain compatibility with modern UDH drivetrain standards
• Create a lightweight gravel race bike or a more capable adventure machine from the same platform

Before You Buy

• This product is a frameset and is not a complete bicycle.
• The frameset does not include a stem or handlebar.
• A drivetrain, crankset, bottom bracket, brakes, wheels, tires, cockpit components, saddle, and additional build components must be purchased separately unless explicitly stated otherwise.
• The supplied custom spacers are intended to support the GT8 internal-routing system, but the appropriate compatible cockpit components are still required.
• Confirm drivetrain, bottom bracket, brake, wheel, cockpit, and routing compatibility before purchasing components for a custom build.
• Maximum tire clearance can vary with actual tire width, rim internal width, tire manufacturer, and required mud clearance.
• Professional bicycle assembly is strongly recommended for a complete frameset build.

The X-LAB GT8 Carbon Gravel Frameset is an exceptional foundation for riders who know exactly how they want their gravel bike built. With Toray T-800 carbon construction, 55mm tire clearance, integrated storage, UDH compatibility, 1x and 2x drivetrain support, and six frame sizes, the GT8 provides the versatility to create anything from a fast gravel race machine to a highly capable all-day adventure bike.