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

Insights

Average stack and reach vs trend of performance road bikes

Design deviates from other sizes of Argon 18 Sum

Stack	543mm	540mm -3mm
Reach	379mm	382mm +3mm
Stack to Reach Ratio	1.43:1	1.41:1
Seat Tube Length, C-T	480mm	—
Seat Tube Length, Unknown	—	460mm
Top Tube Length, Effective/Horizontal HT Top	534mm	—
Top Tube Length, Effective/Horizontal Unknown	—	538mm
Top Tube Slope	9.1deg	10.9deg +1.8deg
Head Tube Angle	72.9deg	72.7deg -0.2deg
Seat Tube Angle	74deg	74deg +0deg
Head Tube Length	136mm	126mm -10mm
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	573.9mm	577.5mm +3.6mm
Front-Center Horizontal	569.4mm	572.3mm +2.9mm
Wheelbase	973mm	975mm +2mm
Fork Offset/Rake	44mm	44mm +0mm
Fork Length (Axle-To-Crown)	372mm	—
Fork Length, Unknown	—	374mm
Trail	58.3mm mid/neutral	58.6mm +0.3mm mid/neutral
Mechanical Trail	55.7mm	55.9mm +0.2mm
Wheel Flop	16.4mm	16.6mm +0.2mm
Tire to Pedal Spindle	64.9mm 170 mm cranks	71.5mm +6.6mm 170 mm cranks
Pedal Spindle to Ground Clearance	97mm 170 mm cranks	89mm -8mm 170 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	1651mm	1647mm -4mm
Crank Length	—	170mm
Handlebar Width	—	42cm
Stem Length	—	90mm
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