Compare: 2024 SEKA Spear Base L vs 2026 Argon 18 Sum Pro M

Insights

Average stack and reach vs trend of performance road bikes

Design deviates from other sizes of Argon 18 Sum

Stack	570mm	564mm -6mm
Reach	389mm	390mm +1mm
Stack to Reach Ratio	1.47:1	1.45:1
Seat Tube Length, C-T	508mm	—
Seat Tube Length, Unknown	—	505mm
Top Tube Length, Effective/Horizontal Center	540mm	—
Top Tube Length, Effective/Horizontal Unknown	—	557mm
Top Tube Slope	8.8deg	8.5deg -0.3deg
Head Tube Angle	73deg	72.7deg -0.3deg
Seat Tube Angle	73.5deg	73.5deg +0deg
Head Tube Length	164mm	151mm -13mm
Bottom Bracket Drop	72mm	77mm +5mm
Bottom Bracket Height	267mm	259mm -8mm
Chainstay Length	410mm	410mm +0mm
Chainstay Length Horizontal	403.6mm	402.7mm -0.9mm
Front-Center	590.8mm	592.3mm +1.5mm
Front-Center Horizontal	586.4mm	587.3mm +0.9mm
Wheelbase	990mm	990mm +0mm
Fork Offset/Rake	44mm	44mm +0mm
Fork Length (Axle-To-Crown)	372mm	—
Fork Length, Unknown	—	374mm
Trail	57.6mm mid/neutral	58.6mm +1mm mid/neutral
Mechanical Trail	55.1mm	55.9mm +0.8mm
Wheel Flop	16.1mm	16.6mm +0.5mm
Tire to Pedal Spindle	81.8mm 170 mm cranks	83.8mm +2mm 172.5 mm cranks
Pedal Spindle to Ground Clearance	97mm 170 mm cranks	86.5mm -10.5mm 172.5 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	28mm	25mm -3mm
Tire Width Max	—	32mm
Tire Outer Diameter	678mm	672mm -6mm
Bike Length with Tires	1668mm	1662mm -6mm
Crank Length	—	172.5mm
Handlebar Width	—	44cm
Stem Length	—	100mm
Suspension Type	Rigid, non-suspension corrected	Rigid, non-suspension corrected
Bar Type	Drop Bar	Drop Bar
Frame Material	Carbon/Composite	Carbon/Composite
Fork Material	Carbon/Composite	Carbon/Composite
Brake Type	Rim	Disc