Opus Fortitude (2025)

endurance road · aluminium · sizes XXS–XL · tyres up to 35 mm Manufacturer’s website

Geometry ?

Opus Fortitude 2025 geometry in sizes XXS–XL: stack 522–620 mm, reach 362–405 mm, head angle 70.5–73°.

	XXS	XS	S	M	L	XL
Stack	522 mm	540 mm	560 mm	580 mm	600 mm	620 mm
Reach	362 mm	370 mm	378 mm	387 mm	396 mm	405 mm
Head angle	70.5°	71.2°	72°	72.5°	72.5°	73°
Seat angle	74.5°	74°	73.5°	73°	72.5°	72°
Seat tube (?)	440 mm	480 mm	520 mm	540 mm	560 mm	580 mm
Head tube	100 mm	120 mm	138 mm	157 mm	178 mm	199 mm
Top tube (effective)	507 mm	525 mm	544 mm	564 mm	585 mm	607 mm
BB drop	79 mm	76 mm	76 mm	76 mm	76 mm	74 mm
Chainstay	416 mm	416 mm	419 mm	419 mm	422 mm	422 mm
Standover	709 mm	736 mm	772 mm	790 mm	810 mm	830 mm
Stock build by size
Cranks	165 mm	170 mm	172.5 mm	172.5 mm	172.5 mm	175 mm
Stem	70 mm	80 mm	90 mm	100 mm	110 mm	120 mm
Bar width	380 mm	400 mm	420 mm	420 mm	440 mm	460 mm

(?) by the seat tube length: the manufacturer doesn’t say whether it’s measured centre to centre (c-c) or centre to top (c-t).

Source: opusbike.com, checked 7 Nov 2026 · bar position: worked out from published data

Stock build

Fortitude 105

Fortitude Tiagra

Source for all builds: opusbike.com, checked 7 Nov 2026

Frames with similar geometry

Stack and reach within 12 mm of size M (stack 580 / reach 387 mm).

Spotted a mistake or a missing build? Let me know.

Are you the manufacturer, or do you sell this bike? I’m missing 2 values for this model’s stem and bars. Add them