Models · Brother

Brother Stroma (2026)

road · steel · sizes XS–XL · tyres up to 38 mm Manufacturer’s website

Geometry ?

Brother Stroma 2026 geometry in sizes XS–XL: stack 532–604 mm, reach 369–402 mm, head angle 71–72.5°.

	XS	S	M	L	XL
Stack	532 mm	550 mm	563 mm	585 mm	604 mm
Reach	369 mm	377 mm	385 mm	393 mm	402 mm
Head angle	71°	72°	72.5°	72.5°	72.5°
Seat angle	74°	73.5°	73°	73°	73°
Seat tube (c-t)	500 mm	520 mm	540 mm	560 mm	580 mm
Head tube	110 mm	125 mm	140 mm	160 mm	180 mm
Top tube (effective)	522 mm	540 mm	557 mm	572 mm	587 mm
BB drop	70 mm	70 mm	70 mm	70 mm	70 mm
Chainstay	420 mm	420 mm	420 mm	420 mm	420 mm
Wheelbase	990 mm	995 mm	1002 mm	1017 mm	1032 mm
Fork length	381 mm	381 mm	381 mm	381 mm	381 mm
Fork offset	45 mm	45 mm	45 mm	45 mm	45 mm

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

Stock build

I don’t have the build for each size yet.

Frames with similar geometry

Stack and reach within 12 mm of size M (stack 563 / reach 385 mm).

Lapierre Sensium (alloy) (2026)size M · stack 562 / reach 385 mm Officine Mattio Granfondo — Comfort (2026)size 54 · stack 563 / reach 386 mm Rivendell Roadini (2026)size 50 · stack 563 / reach 384 mm Twitter R5 Pro 2nd (2026)size L · stack 563 / reach 384 mm Lapierre Pulsium (2026)size M · stack 562 / reach 384 mm Raymon Kirana (2026)size 56 · stack 564 / reach 386 mm

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

Are you the manufacturer, or do you sell this bike? I’m missing 7 values for this model’s stem and bars. Add them