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

Insights

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

Design deviates from other sizes of Giant Bicycles Revolt

Average stack and reach vs trend of progressive gravel bikes

Design deviates from other sizes of XDS X-LAB GT8

Stack	556mm	540mm -16mm
Reach	381mm	379mm -2mm
Stack to Reach Ratio	1.46:1	1.42:1
Seat Tube Length, C-T	—	447mm
Seat Tube Length, Unknown	430mm	—
Top Tube Length, Effective/Horizontal HT Top	—	525mm
Top Tube Length, Unknown	540mm	—
Top Tube Slope	15.9deg	12.3deg -3.6deg
Head Tube Angle	70deg	70deg +0deg
Seat Tube Angle	74deg	75deg +1deg
Head Tube Length	125mm	100mm -25mm
Bottom Bracket Drop	81mm	80mm -1mm
Bottom Bracket Height	272mm	276mm +4mm
Chainstay Length	440mm	435mm -5mm
Chainstay Length Horizontal	432.5mm	427.6mm -4.9mm
Front-Center	611.9mm	610mm -1.9mm
Front-Center Horizontal	606.5mm	604.4mm -2.1mm
Wheelbase	1039mm	1032mm -7mm
Fork Offset/Rake	50mm	54.5mm +4.5mm
Trail	75.3mm high	71.6mm -3.7mm high
Mechanical Trail	70.7mm	67.3mm -3.4mm
Wheel Flop	24.2mm	23mm -1.2mm
Standover Height	724mm	730mm +6mm
Tire to Pedal Spindle	88.9mm 170 mm cranks	84mm -4.9mm 170 mm cranks
Pedal Spindle to Ground Clearance	102mm 170 mm cranks	106mm +4mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	42mm	45mm +3mm
Tire Outer Diameter	706mm	712mm +6mm
Bike Length with Tires	1745mm	1744mm -1mm
Crank Length	170mm	—
Handlebar Width	420mm	—
Stem Length	50mm	—
Suspension Type	Rigid, non-suspension corrected	Rigid, non-suspension corrected
Bar Type	Drop Bar	Drop Bar
Frame Material	Aluminum	Carbon/Composite
Fork Material	Carbon/Composite	Carbon/Composite
Brake Type	Disc	Disc

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