Compare: 2025 Winspace Cycle Co Gravel G3 Base xs vs 2022 Serk Titanium A21 650b wheels S

Insights

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

Design deviates from other sizes of Winspace Cycle Co Gravel G3

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

Design deviates from other sizes of Serk Titanium A21

Stack	539mm	548mm +9mm
Reach	363mm	364mm +1mm
Stack to Reach Ratio	1.48:1	1.51:1
Seat Tube Length, C-T	—	485mm
Seat Tube Length, Unknown	440mm	—
Top Tube Length, Effective/Horizontal HT Top	—	523mm
Top Tube Length, Actual C-C	523mm	—
Top Tube Slope	13.5deg	9.3deg -4.2deg
Head Tube Angle	69.5deg	70deg +0.5deg
Seat Tube Angle	73.5deg	74deg +0.5deg
Head Tube Length	120mm	110mm -10mm
Bottom Bracket Drop	75mm	75mm +0mm
Bottom Bracket Height	281mm	264mm -17mm
Chainstay Length	430mm	430mm +0mm
Chainstay Length Horizontal	423.4mm	423.4mm +0mm
Front-Center	599.3mm	589mm -10.3mm
Front-Center Horizontal	594.6mm	584.6mm -10mm
Wheelbase	1018mm	1008mm -10mm
Fork Offset/Rake	54mm	45mm -9mm
Fork Length (On-Axis)	395mm	—
Trail	75.5mm high	75.5mm +0mm high
Mechanical Trail	70.7mm	70.9mm +0.2mm
Wheel Flop	24.8mm	24.3mm -0.5mm
Standover Height	756mm	—
Tire to Pedal Spindle	73.3mm 170 mm cranks	80mm +6.7mm 170 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	94mm -17mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	650B/27.5 in 584 mm BSD
Tire Width	45mm	47mm +2mm
Tire Outer Diameter	712mm	678mm -34mm
Bike Length with Tires	1730mm	1686mm -44mm
Suspension Type	Rigid, non-suspension corrected	Rigid, non-suspension corrected
Bar Type	Drop Bar	Drop Bar
Frame Material	Carbon/Composite	Titanium
Fork Material	Carbon/Composite	Carbon/Composite
Brake Type	Disc	Disc

Actions	Collection I've Ridden	Collection I've Ridden
Source	https://www.winspace.cc/products/g3-gravel	https://www.serk.cc/a21/
Brand	Winspace Cycle Co	Serk Titanium
Bike	2025 Gravel G3 Base	2022 A21 650b wheels
Size	xs	S
Category	All-road/Gravel	All-road/Gravel