Name: 2026 Argon 18 Anti Matter Base
Brand: Argon 18

	XS	S	M	L	XL
Stack	508mm	531mm	555mm	580mm	607mm
Reach	377mm	384mm	392mm	400mm	409mm
Stack to Reach Ratio	1.35:1	1.38:1	1.42:1	1.45:1	1.48:1
Seat Tube Length, C-T	425mm	460mm	505mm	550mm	595mm
Top Tube Length, Effective/Horizontal HT Top	520mm	538mm	558mm	578mm	601mm
Top Tube Slope	11.4deg	9.9deg	7.5deg	5.5deg	3.9deg
Head Tube Angle	70.7deg	71.1deg	71.1deg	71.1deg	72.2deg
Seat Tube Angle	74.5deg	74deg	73.5deg	73deg	72.5deg
Head Tube Length	76mm	101mm	122mm	150mm	176mm
Bottom Bracket Drop	80mm	78mm	78mm	76mm	76mm
Bottom Bracket Height	276mm	278mm	278mm	280mm	280mm
Chainstay Length	425mm	425mm	425mm	425mm	425mm
Chainstay Length Horizontal	417.4mm	417.8mm	417.8mm	418.2mm	418.2mm
Front-Center	592mm	603.3mm	609.2mm	625.5mm	638.4mm
Front-Center Horizontal	586.6mm	598.2mm	604.2mm	620.9mm	633.9mm
Wheelbase	1004mm	1016mm	1022mm	1039mm	1052mm
Fork Offset/Rake	51mm	51mm	51mm	51mm	51mm
Fork Length (Axle-To-Crown)	400mm	400mm	400mm	400mm	400mm
Trail	70.6mm high	68mm high	68mm high	68mm high	60.7mm mid/neutral
Mechanical Trail	66.7mm	64.3mm	64.3mm	64.3mm	57.8mm
Wheel Flop	22mm	20.8mm	20.8mm	20.8mm	17.7mm
Standover Height	714mm	749mm	788mm	828mm	866mm
Tire to Pedal Spindle	66mm 170 mm cranks	77.3mm 170 mm cranks	83.2mm 170 mm cranks	99.5mm 170 mm cranks	112.4mm 170 mm cranks
Pedal Spindle to Ground Clearance	106mm 170 mm cranks	108mm 170 mm cranks	108mm 170 mm cranks	110mm 170 mm cranks	110mm 170 mm cranks

Very Upright

Somewhat Upright

Average

Somewhat Aggressive

Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Category Trend

Source:https://www.argon18.com/en/bikes/gravel/anti-matter/anti-matter-rival

2026 Argon 18 Anti Matter Base

Geometry