Compare: 2025 Serk Titanium A40 Base XS vs 2026 Argon 18 Anti Matter Base XS

Insights

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

Design deviates from other sizes of Serk Titanium A40

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

Design deviates from other sizes of Argon 18 Anti Matter

Stack	519mm	508mm -11mm
Reach	366mm	377mm +11mm
Stack to Reach Ratio	1.42:1	1.35:1
Seat Tube Length, C-T	—	425mm
Seat Tube Length, Unknown	435mm	—
Top Tube Length, Effective/Horizontal HT Top	—	520mm
Top Tube Length, Effective/Horizontal Unknown	505mm	—
Top Tube Slope	11.7deg	11.4deg -0.3deg
Head Tube Angle	71deg	70.7deg -0.3deg
Seat Tube Angle	75deg	74.5deg -0.5deg
Head Tube Length	90mm	76mm -14mm
Bottom Bracket Drop	77mm	80mm +3mm
Bottom Bracket Height	274mm	276mm +2mm
Chainstay Length	420mm	425mm +5mm
Chainstay Length Horizontal	412.9mm	417.4mm +4.5mm
Front-Center	573.3mm	592mm +18.7mm
Front-Center Horizontal	568.1mm	586.6mm +18.5mm
Wheelbase	981mm	1004mm +23mm
Fork Offset/Rake	47mm	51mm +4mm
Fork Length (Axle-To-Crown)	—	400mm
Trail	71.2mm high	70.6mm -0.6mm high
Mechanical Trail	67.3mm	66.7mm -0.6mm
Wheel Flop	21.9mm	22mm +0.1mm
Standover Height	722mm	714mm -8mm
Tire to Pedal Spindle	52.3mm 170 mm cranks	66mm +13.7mm 170 mm cranks
Pedal Spindle to Ground Clearance	104mm 170 mm cranks	106mm +2mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	40mm	45mm +5mm
Tire Width Max	—	55mm
Tire Outer Diameter	702mm	712mm +10mm
Bike Length with Tires	1683mm	1716mm +33mm
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	Unknown	Disc