Geometry ?
Principia Gravel C20 2026 geometry in sizes 50–56: stack 581.5–628.3 mm, reach 369.6–396.5 mm, head angle 70.8–71.2°.
| 50 | 52 | 54 | 56 | |
|---|---|---|---|---|
| Stack | 581.5 mm | 597.7 mm | 609.4 mm | 628.3 mm |
| Reach | 369.6 mm | 379.4 mm | 387.6 mm | 396.5 mm |
| Head angle | 70.8° | 71.2° | 71.2° | 71.2° |
| Seat angle | 73.2° | 73.2° | 72.9° | 72.9° |
| Head tube | 135 mm | 150 mm | 165 mm | 185 mm |
| BB drop | 82.5 mm | 82.5 mm | 80 mm | 80 mm |
| Chainstay | 435 mm | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1023.9 mm | 1034.2 mm | 1047.7 mm | 1063 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 50 (stack 581.5 / reach 369.6 mm).
Momsen Gravel Plus (2026)size S · stack 582 / reach 370 mmFinna Landscape UDH (2026)size S · stack 582 / reach 370 mmSoma Jawbone (2026)size 52 · stack 582 / reach 369 mmPrincipia Gravel 30 (2026)size 51 · stack 580 / reach 371 mm3T Ultra 2 ITALIA (2026)size M · stack 580 / reach 368 mmFuji Jari (2022)size M · stack 581 / reach 372 mm
Stack and reach within 12 mm of size 52 (stack 597.7 / reach 379.4 mm).
Momsen Gravel Plus (2026)size M · stack 598 / reach 380 mmTout Terrain Blueridge (2026)size S · stack 597 / reach 379 mmRitte Satir (2026)size L · stack 597 / reach 380 mmPanorama Anticosti (2026)size MEDIUM · stack 599 / reach 381 mmLitespeed Cherohala (2026)size M/L · stack 600 / reach 380 mmKona Ouroboros (alloy) (2026)size 52 · stack 598 / reach 382 mm
Stack and reach within 12 mm of size 54 (stack 609.4 / reach 387.6 mm).
Momsen Gravel Plus (2026)size L · stack 609 / reach 388 mmRadon Regard AL (2026)size 58 · stack 609 / reach 389 mmCube Nuroad (alloy) (2027)size L · stack 610 / reach 389 mmFairlight Secan 3.0 (2026)size 56T · stack 610 / reach 386 mmCurve GXR4 (2026)size LG · stack 608 / reach 386 mmCurve Kevin of Steel 4 (2026)size LG · stack 608 / reach 386 mm
Stack and reach within 12 mm of size 56 (stack 628.3 / reach 396.5 mm).
Author Ronin SL (2025)size 58 cm · stack 628 / reach 397 mmMomsen Gravel Plus (2026)size XL · stack 628 / reach 397 mmMason Exposure (2026)size 60CM · stack 628 / reach 396 mmLightCarbon LCG074-D (2026)size 580 · stack 627 / reach 397 mmKinesis G2 (2026)size 60cm (XL) · stack 630 / reach 397 mmCurve GXR4 (2026)size XL · stack 627 / reach 395 mm
Spotted a mistake or a missing build? Let me know.
Are you the manufacturer, or do you sell this bike? I’m missing 6 values for this model’s stem and bars. Add them