Compare: 2026 Argon 18 Sum Pro M vs 2025 TanTan Cycling (Seraph) TT-X67 Base 56

Insights

Average stack and reach vs trend of performance road bikes

Design deviates from other sizes of Argon 18 Sum

Average stack and reach vs trend of performance road bikes

Design deviates from other sizes of TanTan Cycling (Seraph) TT-X67

Stack	564mm	565mm +1mm
Reach	390mm	392mm +2mm
Stack to Reach Ratio	1.45:1	1.44:1
Seat Tube Length, Unknown	505mm	525mm +20mm
Top Tube Length, Effective/Horizontal Unknown	557mm	559mm +2mm
Top Tube Slope	8.5deg	6.5deg -2deg
Head Tube Angle	72.7deg	73deg +0.3deg
Seat Tube Angle	73.5deg	73.5deg +0deg
Head Tube Length	151mm	159mm +8mm
Bottom Bracket Drop	77mm	72mm -5mm
Bottom Bracket Height	259mm	267mm +8mm
Chainstay Length	410mm	405mm -5mm
Chainstay Length Horizontal	402.7mm	398.6mm -4.1mm
Front-Center	592.3mm	598mm +5.7mm
Front-Center Horizontal	587.3mm	592.5mm +5.2mm
Wheelbase	990mm	991mm +1mm
Fork Offset/Rake	44mm	48mm +4mm
Fork Length, Unknown	374mm	370mm -4mm
Trail	58.6mm mid/neutral	53.5mm -5.1mm mid/neutral
Mechanical Trail	55.9mm	51.1mm -4.8mm
Wheel Flop	16.6mm	14.9mm -1.7mm
Standover Height	—	810mm
Tire to Pedal Spindle	83.8mm 172.5 mm cranks	89mm +5.2mm 170 mm cranks
Pedal Spindle to Ground Clearance	86.5mm 172.5 mm cranks	97mm +10.5mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	25mm	28mm +3mm
Tire Width Max	32mm	32mm +0mm
Tire Outer Diameter	672mm	678mm +6mm
Bike Length with Tires	1662mm	1669mm +7mm
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	Disc	Disc