Velopedia Bicycle Archive
2026 X-LAB GT8
Original manufacturer specifications including GRX Di2 drivetrain, 700C wheels, 8.78 kg / 19.31 lbs (Size M) published weight.
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What Velopedia knows
- Model year
- 2026
- Category
- Gravel & Cyclocross
- Original MSRP
- $3,199.00
- Sizes
- XS, S, M, L, XL, XXL
- Colors
- Afterburner Black, Slipstream, Recon Green
- Weight
- 8.78 kg / 19.31 lbs (Size M)
- Geometry
- 6 manufacturer sizes · Geometry context
- Record coverage
- 21 preserved details · 8 archived images · original MSRP · preserved geometry
- Archive ID
- 900001318
Frameset
| Frame Construction | XDS Carbon Frame, Toray T-800, UDH Compatible |
|---|---|
| Frame Material | Carbon |
| Fork | XDS Carbon Fork, Toray T-800, 100x12mm Thru-Axle |
| Fork Material | Carbon |
Drivetrain
| Component Group | GRX Di2 |
|---|---|
| Shifters | Shimano GRX ST-RX717 Di2 |
| Rear Derailleur | Shimano GRX RD-RX717 Di2 |
| Crankset | Branta Alloy Power Meter Crankset, 40T, Narrow-wide Teeth; 24mm Steel Spindle, Apple Find My Anti-Theft Technology |
| Bottom Bracket | T47 24mm |
| Cassette | Shimano CS-M6100-12, 10-51T |
| Chain | Shimano CN-M6100 |
Brakes
| Brakes | Shimano GRX BR-RX410; Rotors: Shimano SM-CL700, F:160mm R:160mm |
|---|
Cockpit & Contact Points
| Handlebar | Branta Gravel Carbon Handlebar |
|---|---|
| Stem | Branta Carbon Stem |
| Saddle | Fizik Terra Argo X7 |
| Seatpost | XDS Carbon 27.2mm |
Wheels & Tires
| Wheels | Branta C45 Gravel Carbon Wheelset, Stainless Steel Spokes |
|---|---|
| Front Tire | Continental Terra Trail 700x45C; Max Tire Clearance: 55C |
| Rear Tire | Continental Terra Trail 700x45C; Max Tire Clearance: 55C |
| Wheel Size | 700C |
Size-specific frame data
Geometry
Manufacturer-published geometry normalized for consistent archival comparison. Effective top tube and reach remain separate measurements because they describe different aspects of fit.
| Measurement | XS | S | M | L | XL | XXL |
|---|---|---|---|---|---|---|
| Seat tube | 435 mm | 447 mm | 471 mm | 491 mm | 532 mm | 577 mm |
| Top tube | 506 mm | 525 mm | 547 mm | 566 mm | 585 mm | 605 mm |
| Head tube | 80 mm | 100 mm | 120 mm | 140 mm | 165 mm | 190 mm |
| Head-tube angle | 70° | 70° | 71° | 71° | 71° | 71° |
| Seat-tube angle | 76° | 75° | 74° | 74° | 73° | 73° |
| Chainstay / rear center | 435 mm | 435 mm | 435 mm | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1020 mm | 1032 mm | 1031 mm | 1046 mm | 1061 mm | 1078 mm |
| Bottom-bracket drop | 80 mm | 80 mm | 80 mm | 80 mm | 80 mm | 80 mm |
| Reach | 370 mm | 379 mm | 384 mm | 392 mm | 399 mm | 408 mm |
| Stack | 519 mm | 540 mm | 565 mm | 584 mm | 607 mm | 631 mm |
| Standover height | 715 mm | 730 mm | 755 mm | 773 mm | 807 mm | 838 mm |
| Front center | 598 mm | 610 mm | 609 mm | 624 mm | 638 mm | 655 mm |
Geometry source: X-LAB first-party Basic geometry table ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Geometry tools
Analyze a published size
XS geometry
Archive context: The seat angle of 76° sits toward the steeper end. Its stack of 519 mm sits toward the lower end. Its bottom-bracket drop of 80 mm sits toward the deeper-drop end.
Compared with 34 distinct cyclocross/gravel geometries in the XS-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XS geometry S geometry
Archive context: The seat angle of 75° sits toward the steeper end. Its bottom-bracket drop of 80 mm sits toward the deeper-drop end. Its stack of 540 mm sits somewhat lower than typical.
Compared with 81 distinct cyclocross/gravel geometries in the Small-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze S geometry M geometry
Archive context: Its bottom-bracket drop of 80 mm sits toward the deeper-drop end. Its stack of 565 mm sits toward the lower end. The chainstay of 435 mm sits somewhat longer than typical.
Compared with 93 distinct cyclocross/gravel geometries in the Medium-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze M geometry L geometry
Archive context: Its bottom-bracket drop of 80 mm sits toward the deeper-drop end. Its stack of 584 mm sits toward the lower end. The seat angle of 74° sits somewhat steeper than typical.
Compared with 66 distinct cyclocross/gravel geometries in the Large-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze L geometry XL geometry
Archive context: Its bottom-bracket drop of 80 mm sits toward the deeper-drop end. Its reach of 399 mm sits toward the shorter end. Its stack of 607 mm sits toward the lower end.
Compared with 71 distinct cyclocross/gravel geometries in the XL-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XL geometry XXL geometry
Archive context: Its bottom-bracket drop of 80 mm sits toward the deeper-drop end. The chainstay of 435 mm sits toward the longer rear-center end. The head angle of 71° sits somewhat slacker than typical.
Compared with 20 distinct cyclocross/gravel geometries in the XXL-equivalent size cohort from model years 2024–2027 in the Velopedia archive.Want to go deeper?Open this exact published size and configuration in the Velopedia Geometry Analyzer, then complete any measurements the manufacturer did not provide.
Analyze XXL geometry Parts & serviceability
Find replacement parts
Shimano CN-M6100
Exact archived model
Shimano CS-M6100-12, 10-51T
Exact archived model
Continental Terra Trail 700x45C; Max Tire Clearance: 55C
Named tire and published size
More qualified parts (5)
Shimano GRX BR-RX410
Brake model identified — verify pad shape
Fizik Terra Argo X7
Named archived component — verify exact version
Shimano GRX RD-RX717 Di2
Exact archived model
Shimano GRX ST-RX717 Di2
Exact archived model
27.2 mm seatpost
Published diameter — verify length and setback
Searches use the archived manufacturer specification, not the components currently installed on a particular bicycle. Confirm the exact model, size and fit before ordering. As an Amazon Associate I earn from qualifying purchases. Velopedia may also earn from qualifying eBay purchases. Velopedia may also earn from qualifying retailer purchases. Commercial relationships do not influence Archive specifications or analysis.
Used-bike inspection
If you’re buying this bike used
Before any test ride: both brakes should stop the bike firmly and release cleanly; both wheels should run true and be securely attached; tires should have no casing damage; and the headset, handlebar, stem, cranks and pedals should have no looseness or play.
Follow the full used-bike inspection order →- FrameInspect the frame in bright light, especially around the head tube, bottom bracket, chainstays and clamped areas. Look for cracks, ripples, crushed sections or signs of a previous impact.Inspect the frame and fork →
- BrakesTest each brake separately and confirm it stops firmly and releases cleanly. Inspect the pads and braking surfaces for wear or contamination, and check the cables or hoses for damage.Inspect the brakes →
- DrivetrainConfirm every shift-system battery charges, every shift control works and the derailleur moves cleanly across the cassette. Make sure the matching shift-system charger is included, then measure chain wear and inspect the cassette teeth.Check drivetrain wear →
- Wheels & tiresSpin both wheels and watch the rims for side-to-side or vertical movement. Check for dents, cracks, loose or uneven spokes and hub play, then inspect both tire casings for cuts, cracking or exposed threads.Check wheels and tires →
- Bottom bracketTurn the cranks slowly, feel for rough bearings and check for side-to-side play. Creaking under load deserves investigation but does not identify the source by itself.Inspect the bottom bracket and shell →
Bike-specific inspection checklist 19 checks based on 5 archived component groups Open checklistClose checklist
This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.
Identity and fit
Follow the full used-bike inspection order →Archived: 2026 X-LAB GT8 · Cyclocross/Gravel · Published sizes: XS, S, M, L, XL, XXL
Frame and fork
Inspect the frame and fork →Archived: Frame: XDS Carbon Frame, Toray T-800, UDH Compatible · Fork: XDS Carbon Fork, Toray T-800, 100x12mm Thru-Axle · Carbon
Drivetrain
Check drivetrain wear →Archived: Group: GRX Di2 · Shifters: Shimano GRX ST-RX717 Di2 · Rear derailleur: Shimano GRX RD-RX717 Di2 · Crankset: Branta Alloy Power Meter Crankset, 40T, Narrow-wide Teeth; 24mm Steel Spindle, Apple Find My Anti-Theft Technology · Bottom bracket: T47 24mm · Cassette: Shimano CS-M6100-12, 10-51T · Chain: Shimano CN-M6100
Brakes
Inspect the brakes →Archived: Brakes: Shimano GRX BR-RX410; Rotors: Shimano SM-CL700, F:160mm R:160mm
Wheels and tires
Check wheels and tires →Archived: Wheel size: 700C · Wheels: Branta C45 Gravel Carbon Wheelset, Stainless Steel Spokes · Front tire: Continental Terra Trail 700x45C; Max Tire Clearance: 55C · Rear tire: Continental Terra Trail 700x45C; Max Tire Clearance: 55C
Controls and contact points
Archived: Handlebar: Branta Gravel Carbon Handlebar · Stem: Branta Carbon Stem · Seatpost: XDS Carbon 27.2mm · Saddle: Fizik Terra Argo X7
Before and during the test ride
Follow the full used-bike inspection order →Build relationships are limited to the archived manufacturer specifications. Confirm exact fit and standards before ordering parts or performing service.
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Gallery
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.