2026 X-Lab GT8 Base
- Category
- All-road/Gravel
- Design
- Drop Bar, Rigid, non-suspension corrected
- Frame
- Carbon/Composite
- Fork
- Carbon/Composite
- Features
- Disc brake
Geometry
XS | S | M | L | XL | XXL | |
Stack | 519mm | 540mm | 565mm | 584mm | 607mm | 631mm |
Reach | 370mm | 379mm | 384mm | 392mm | 399mm | 408mm |
Stack to Reach Ratio | 1.4:1 | 1.42:1 | 1.47:1 | 1.49:1 | 1.52:1 | 1.55:1 |
Seat Tube Length, C-T | 435mm | 447mm | 471mm | 491mm | 532mm | 577mm |
Top Tube Length, Effective/Horizontal Center | 506mm | 525mm | 547mm | 566mm | 585mm | 605mm |
Head Tube Angle | 70deg | 70deg | 71deg | 71deg | 71deg | 71deg |
Seat Tube Angle, Unknown | 76deg | 75deg | 74deg | 74deg | 73deg | 73deg |
Head Tube Length | 80mm | 100mm | 120mm | 140mm | 165mm | 190mm |
Bottom Bracket Drop | 80mm | 80mm | 80mm | 80mm | 80mm | 80mm |
Bottom Bracket Height | 276mm | 276mm | 276mm | 276mm | 276mm | 276mm |
Chainstay Length | 435mm | 435mm | 435mm | 435mm | 435mm | 435mm |
Chainstay Length Horizontal | 427.6mm | 427.6mm | 427.6mm | 427.6mm | 427.6mm | 427.6mm |
Front-Center | 598mm | 610mm | 609mm | 624mm | 638mm | 655mm |
Front-Center Horizontal | 592.4mm | 604.4mm | 603.4mm | 618.4mm | 633.4mm | 650.4mm |
Wheelbase | 1020mm | 1032mm | 1031mm | 1046mm | 1061mm | 1078mm |
Fork Offset/Rake | 55mm | 55mm | 50mm | 50mm | 50mm | 50mm |
Trail | 71mm high | 71mm high | 69.7mm high | 69.7mm high | 69.7mm high | 69.7mm high |
Mechanical Trail | 66.8mm | 66.8mm | 65.9mm | 65.9mm | 65.9mm | 65.9mm |
Wheel Flop | 22.8mm | 22.8mm | 21.5mm | 21.5mm | 21.5mm | 21.5mm |
Standover Height | 715mm | 730mm | 755mm | 773mm | 807mm | 838mm |
Tire to Pedal Spindle | 77mm 165 mm cranks | 89mm 165 mm cranks | 83mm 170 mm cranks | 98mm 170 mm cranks | 109.5mm 172.5 mm cranks | 126.5mm 172.5 mm cranks |
Pedal Spindle to Ground Clearance | 111mm 165 mm cranks | 111mm 165 mm cranks | 106mm 170 mm cranks | 106mm 170 mm cranks | 103.5mm 172.5 mm cranks | 103.5mm 172.5 mm cranks |
Base Build
XS | S | M | L | XL | XXL | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm |
Tire Width Max | 55mm | 55mm | 55mm | 55mm | 55mm | 55mm |
Tire Outer Diameter | 712mm | 712mm | 712mm | 712mm | 712mm | 712mm |
Bike Length with Tires | 1732mm | 1744mm | 1743mm | 1758mm | 1773mm | 1790mm |
Crank Length | 165mm | 165mm | 170mm | 170mm | 172.5mm | 172.5mm |
Handlebar Width | 370mm | 370mm | 390mm | 390mm | 410mm | 410mm |
Stem Length | 70mm | 70mm | 80mm | 90mm | 100mm | 100mm |
Published Sizing Recommendations
Height | 148 cm to 158 cm | 158 cm to 168 cm | 168 cm to 176 cm | 176 cm to 183 cm | 183 cm to 191 cm | 191 cm to 202 cm |
Stack and Reach vs. Category Trend
Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive
The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.
Learn more about the Upright/Aggressive ScaleCategory Trend
All-road/GravelSource:https://xds.co/products/gt8#product-geometry