Compare: 2026/v2 XDS X-LAB GT8 Base XXL vs 2025 Giant Bicycles Revolt Base XL

Insights

Very upright stack and reach vs trend of progressive gravel bikes

Design deviates from other sizes of XDS X-LAB GT8

Average stack and reach vs trend of all-road/gravel bikes

Design deviates from other sizes of Giant Bicycles Revolt

Stack	631mm	630mm -1mm
Reach	408mm	407mm -1mm
Stack to Reach Ratio	1.55:1	1.55:1
Seat Tube Length, C-T	577mm	—
Seat Tube Length, Unknown	—	530mm
Top Tube Length, Effective/Horizontal HT Top	605mm	—
Top Tube Length, Unknown	—	600mm
Top Tube Slope	7.8deg	12.4deg +4.6deg
Head Tube Angle	71deg	72deg +1deg
Seat Tube Angle	73deg	73deg +0deg
Head Tube Length	190mm	195mm +5mm
Bottom Bracket Drop	80mm	81mm +1mm
Bottom Bracket Height	276mm	272mm -4mm
Chainstay Length	435mm	440mm +5mm
Chainstay Length Horizontal	427.6mm	432.5mm +4.9mm
Front-Center	655mm	643.6mm -11.4mm
Front-Center Horizontal	650.4mm	638.5mm -11.9mm
Wheelbase	1078mm	1071mm -7mm
Fork Offset/Rake	49.8mm	50mm +0.2mm
Trail	69.9mm high	62.1mm -7.8mm mid/neutral
Mechanical Trail	66.1mm	59.1mm -7mm
Wheel Flop	21.5mm	18.3mm -3.2mm
Standover Height	838mm	810mm -28mm
Tire to Pedal Spindle	129mm 170 mm cranks	115.6mm -13.4mm 175 mm cranks
Pedal Spindle to Ground Clearance	106mm 170 mm cranks	97mm -9mm 175 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	45mm	42mm -3mm
Tire Outer Diameter	712mm	706mm -6mm
Bike Length with Tires	1790mm	1777mm -13mm
Crank Length	—	175mm
Handlebar Width	—	460mm
Stem Length	—	90mm
Suspension Type	Rigid, non-suspension corrected	Rigid, non-suspension corrected
Bar Type	Drop Bar	Drop Bar
Frame Material	Carbon/Composite	Aluminum
Fork Material	Carbon/Composite	Carbon/Composite
Brake Type	Disc	Disc

Actions	Collection I've Ridden	Collection I've Ridden
Source	https://xds.co/en-us/products/gt8#product-geometry	Giant
Brand	XDS X-LAB	Giant Bicycles
Bike	2026/v2 GT8 Base	2025 Revolt Base
Size	XXL	XL
Category	Progressive Gravel	All-road/Gravel