Compare: 2026 Argon 18 Dark Matter 3D High Stack XS vs 2026 Mondince FM 366 Base 490

Insights

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

Design deviates from other sizes of Argon 18 Dark Matter

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

Design deviates from other sizes of Mondince FM 366

Stack	564mm	562mm -2mm
Reach	373mm	364mm -9mm
Stack to Reach Ratio	1.51:1	1.54:1
Seat Tube Length, C-T	435mm	—
Seat Tube Length, C-TTT	—	460mm
Top Tube Length, Effective/Horizontal Center	—	525mm
Top Tube Length, Effective/Horizontal HT Top	530mm	—
Top Tube Slope	16.5deg	11.5deg -5deg
Head Tube Angle	70deg	70.5deg +0.5deg
Seat Tube Angle	74.9deg	74deg -0.9deg
Head Tube Length	112mm	125mm +13mm
Bottom Bracket Drop	80mm	80mm +0mm
Bottom Bracket Height	281mm	288mm +7mm
Chainstay Length	436mm	430mm -6mm
Chainstay Length Horizontal	428.6mm	422.5mm -6.1mm
Front-Center	612.7mm	597.9mm -14.8mm
Front-Center Horizontal	607.4mm	592.5mm -14.9mm
Wheelbase	1036mm	1015mm -21mm
Fork Offset/Rake	54mm	54.5mm +0.5mm
Fork Length (On-Axis)	—	405mm
Fork Length (Axle-To-Crown)	425mm	—
Trail	73.9mm high	72.5mm -1.4mm high
Mechanical Trail	69.5mm	68.3mm -1.2mm
Wheel Flop	23.8mm	22.8mm -1mm
Standover Height	729mm	—
Tire to Pedal Spindle	81.7mm 170 mm cranks	59.9mm -21.8mm 170 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	118mm +7mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	50mm	57mm +7mm
Tire Width Max	57mm	57mm +0mm
Tire Outer Diameter	722mm	736mm +14mm
Bike Length with Tires	1758mm	1751mm -7mm
Suspension Type	Rigid, 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