Argon 18 Sum 2026: geometry, stack and reach

Geometry ?

Argon 18 Sum 2026 geometry in sizes XXS–XL: stack 471–592 mm, reach 375–414 mm, head angle 71.2–73°.

	XXS	XS	S	M	L	XL
Stack	471 mm	493 mm	516 mm	540 mm	565 mm	592 mm
Reach	375 mm	382 mm	389 mm	397 mm	405 mm	414 mm
Head angle	71.2°	72.1°	72.7°	72.7°	72.7°	73°
Seat angle	75°	74.5°	74°	73.5°	73°	72.5°
Seat tube (c-t)	395 mm	425 mm	460 mm	505 mm	550 mm	595 mm
Head tube	69 mm	85 mm	101 mm	126 mm	152 mm	180 mm
Top tube (effective)	503 mm	520 mm	538 mm	557 mm	578 mm	600 mm
BB drop	69 mm	73 mm	77 mm	77 mm	77 mm	77 mm
Chainstay	410 mm	410 mm	410 mm	410 mm	410 mm	410 mm
Wheelbase	967 mm	972 mm	975 mm	990 mm	1006 mm	1020 mm
Standover	676 mm	700 mm	727 mm	766 mm	804 mm	841 mm
Stock build by size
Cranks	165 mm	170 mm	170 mm	172.5 mm	172.5 mm	175 mm
Stem	70 mm	80 mm	90 mm	100 mm	110 mm	120 mm
Bar width Sum SRAM Force AXS	380 mm	400 mm	400 mm	400 mm	420 mm	420 mm
Bar width Sum Shimano Ultegra Di2	380 mm	380 mm	400 mm	400 mm	420 mm	420 mm

Source: argon18.com, checked 1 Nov 2026 · bar position: worked out from published data

Older model years in the archive with the same stack, reach and head angle: 2022–2025. Source: storage.googleapis.com

Stock build

Sum SRAM Force AXS €5,250

Sum Shimano Ultegra Di2 €4,550

Sum Shimano 105 Di2 €3,850

Source for all builds: argon18.com, checked 1 Nov 2026

Frames with similar geometry

Stack and reach within 12 mm of size M (stack 540 / reach 397 mm).

Argon 18 Sum (2026)