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

Insights

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

Design deviates from other sizes of Serk Titanium A21

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

Design deviates from other sizes of Winspace Cycle Co Gravel G3

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

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

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