Compare: 2025 Serk Titanium A40 Base XXL vs 2026 Argon 18 Equation Base XL 60-62

Insights

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

Design deviates from other sizes of Serk Titanium A40

Somewhat aggressive stack and reach vs trend of endurance road bikes

Design deviates from other sizes of Argon 18 Equation

Stack	638mm	623mm -15mm
Reach	406mm	407mm +1mm
Stack to Reach Ratio	1.57:1	1.53:1
Seat Tube Length, C-T	—	590mm
Seat Tube Length, Unknown	585mm	—
Top Tube Length, Effective/Horizontal HT Top	—	604mm
Top Tube Length, Effective/Horizontal Unknown	601mm	—
Top Tube Slope	7.8deg	5.9deg -1.9deg
Head Tube Angle	71.5deg	72.5deg +1deg
Seat Tube Angle	73deg	72.5deg -0.5deg
Head Tube Length	218mm	189mm -29mm
Bottom Bracket Drop	73mm	75mm +2mm
Bottom Bracket Height	278mm	264mm -14mm
Chainstay Length	420mm	420mm +0mm
Chainstay Length Horizontal	413.6mm	413.3mm -0.3mm
Front-Center	648.5mm	634.2mm -14.3mm
Front-Center Horizontal	644.4mm	629.8mm -14.6mm
Wheelbase	1058mm	1043mm -15mm
Fork Offset/Rake	47mm	47mm +0mm
Fork Length (Axle-To-Crown)	—	387mm
Trail	67.9mm high	57.6mm -10.3mm mid/neutral
Mechanical Trail	64.4mm	54.9mm -9.5mm
Wheel Flop	20.4mm	16.5mm -3.9mm
Standover Height	855mm	827mm -28mm
Tire to Pedal Spindle	127.5mm 170 mm cranks	125.2mm -2.3mm 170 mm cranks
Pedal Spindle to Ground Clearance	108mm 170 mm cranks	94mm -14mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	40mm	28mm -12mm
Tire Outer Diameter	702mm	678mm -24mm
Bike Length with Tires	1760mm	1721mm -39mm
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