Models · Principia · Gravel

Principia Gravel 40 (2026)

gravel · aluminium · sizes 48–59 Manufacturer’s website

Geometry ?

Principia Gravel 40 2026 geometry in sizes 48–59: stack 533.6–619 mm, reach 373–407 mm, head angle 69.5–72°.

	48	51	54	56	59
Stack	533.6 mm	556.3 mm	579 mm	598 mm	619 mm
Reach	373 mm	377.5 mm	389 mm	398.5 mm	407 mm
Head angle	69.5°	70.5°	71.5°	71.2°	72°
Seat angle	74°	74°	74°	74°	74°
Head tube	115 mm	135 mm	155 mm	175 mm	195 mm
BB drop	67 mm	67 mm	67 mm	67 mm	67 mm
Chainstay	435 mm	435 mm	435 mm	435 mm	435 mm
Wheelbase	1025.3 mm	1028.3 mm	1037.6 mm	1053.5 mm	1063.5 mm
Fork length	400 mm	400 mm	400 mm	400 mm	400 mm
Fork offset	45 mm	45 mm	45 mm	45 mm	45 mm

Source: principiabikes.com, checked 13 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 54 (stack 579 / reach 389 mm).

Distance 40 / 40i (2026)size L · stack 579 / reach 389 mm Seka ExAero GR RDC (2026)size 56 · stack 579 / reach 389 mm Mason Definition 3 (2026)size 56CM · stack 580 / reach 388 mm Mason Resolution 3 (2026)size 56CM · stack 580 / reach 388 mm Bergamont Grandurance (alloy, HIGH) (2026)size M · stack 579 / reach 390 mm Bergamont Grandurance (alloy, MID) (2026)size M · stack 579 / reach 390 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