Isaac Torus (2026)

gravel · carbon · sizes XS–XXL · tyres up to 45 mm Manufacturer’s website

Good to know: Configurable build

Configurable build (at least partly: the cockpit or bar width, for example). The stock build below is only one of the options.

Geometry ?

Isaac Torus 2026 geometry in sizes XS–XXL: stack 535–624 mm, reach 356–400 mm, head angle 70–71°.

	XS	S	M	L	XL	XXL
Stack	535 mm	554 mm	567 mm	582 mm	600 mm	624 mm
Reach	356 mm	366 mm	372 mm	378 mm	386 mm	400 mm
Head angle	70°	70°	70.5°	71°	71°	71°
Seat angle	75°	74.5°	74°	73.5°	73.5°	73°
Seat tube (c-t)	480 mm	500 mm	520 mm	540 mm	560 mm	580 mm
Head tube	114.9 mm	135.1 mm	146.8 mm	158.9 mm	177.9 mm	203.3 mm
Top tube (effective)	499.4 mm	519.7 mm	534.4 mm	550.5 mm	563.7 mm	590.8 mm
BB drop	72 mm	72 mm	72 mm	72 mm	72 mm	72 mm
Chainstay	430 mm	430 mm	430 mm	430 mm	430 mm	430 mm
Wheelbase	1001.7 mm	1018.6 mm	1024.3 mm	1025.1 mm	1039.3 mm	1061.6 mm
Fork offset	50 mm	50 mm	50 mm	45 mm	45 mm	45 mm
Stock build by size
Cranks	170 mm	170 mm	170 mm	172.5 mm	172.5 mm	172.5 mm
Stem	80 mm	90 mm	100 mm	110 mm	110 mm	120 mm
Stem angle	−8°	−8°	−8°	−8°	−8°	−8°
Bar width	380 mm	380 mm	400 mm	400 mm	420 mm	420 mm
Seatpost setback	10 mm	–	–	–	–	–

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

Stock build

Torus Shimano GRX RX610 2x12, DT Swiss G1800 €3,399

Options when ordering (manufacturer’s default in bold):

Size	Stem
all	80, 90, 100, 110, 120 mm

Source: isaac-cycle.com, checked 1 Nov 2026

Frames with similar geometry

Stack and reach within 12 mm of size L (stack 582 / reach 378 mm).

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