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

Insights

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

Design deviates from other sizes of Giant Bicycles Revolt

Very upright stack and reach vs trend of progressive gravel bikes

Design deviates from other sizes of XDS X-LAB GT8

Stack	602mm	607mm +5mm
Reach	391mm	399mm +8mm
Stack to Reach Ratio	1.54:1	1.52:1
Seat Tube Length, C-T	—	532mm
Seat Tube Length, Unknown	490mm	—
Top Tube Length, Effective/Horizontal HT Top	—	585mm
Top Tube Length, Unknown	575mm	—
Top Tube Slope	14deg	10.1deg -3.9deg
Head Tube Angle	72deg	71deg -1deg
Seat Tube Angle	73deg	73deg +0deg
Head Tube Length	165mm	165mm +0mm
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	617.9mm	638mm +20.1mm
Front-Center Horizontal	612.5mm	633.4mm +20.9mm
Wheelbase	1045mm	1061mm +16mm
Fork Offset/Rake	50mm	50.1mm +0.1mm
Trail	62.1mm mid/neutral	69.6mm +7.5mm high
Mechanical Trail	59.1mm	65.8mm +6.7mm
Wheel Flop	18.3mm	21.4mm +3.1mm
Standover Height	776mm	807mm +31mm
Tire to Pedal Spindle	92.4mm 172.5 mm cranks	112mm +19.6mm 170 mm cranks
Pedal Spindle to Ground Clearance	99.5mm 172.5 mm cranks	106mm +6.5mm 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	1751mm	1773mm +22mm
Crank Length	172.5mm	—
Handlebar Width	440mm	—
Stem Length	80mm	—
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	ML	XL
Category	All-road/Gravel	Progressive Gravel