Geometry ?
Principia Gravel 20 2026 geometry in sizes 45–61: stack 575.8–663.9 mm, reach 397.3–410.9 mm, head angle 70–73°.
| 45 | 50 | 55 | 61 | |
|---|---|---|---|---|
| Stack | 575.8 mm | 598.8 mm | 624.5 mm | 663.9 mm |
| Reach | 397.3 mm | 399 mm | 397.4 mm | 410.9 mm |
| Head angle | 70° | 71° | 71.5° | 73° |
| Seat angle | 74.5° | 74.5° | 74.5° | 74.5° |
| Head tube | 135 mm | 155 mm | 180 mm | 215 mm |
| BB drop | 67 mm | 67 mm | 67 mm | 67 mm |
| Chainstay | 435 mm | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1060.5 mm | 1060.5 mm | 1061.6 mm | 1071.2 mm |
| Fork length | 425 mm | 425 mm | 425 mm | 425 mm |
| Fork offset | 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 45 (stack 575.8 / reach 397.3 mm).
Scott Addict Gravel (HMX) (2026)size M/54 · stack 575 / reach 398 mmFairlight Faran 3.0 (2026)size 56R · stack 576 / reach 396 mmFairlight Secan 3.0 (2026)size 56R · stack 576 / reach 396 mmOlympia Handy (2027)size L · stack 574 / reach 398 mmStandert Kieswerk (2026)size 56 · stack 577 / reach 399 mmStevens Camino (2027)size 54 · stack 577 / reach 399 mm
Stack and reach within 12 mm of size 50 (stack 598.8 / reach 399 mm).
Winspace G5 (2026)size XL · stack 598 / reach 399 mmPrincipia Gravel 40 (2026)size 56 · stack 598 / reach 398 mmKoga Colmaro Allroad (2026)size L · stack 599 / reach 400 mmOfficine Mattio Bisalta (2026)size XL · stack 599 / reach 400 mmOfficine Mattio Santiago AC (2026)size XL · stack 599 / reach 400 mmSimplon Array (2026)size 53/M · stack 599 / reach 398 mm
Stack and reach within 12 mm of size 55 (stack 624.5 / reach 397.4 mm).
Trek Boone (2026)size 61 · stack 624 / reach 397 mmEnigma Esker (2026)size 59 · stack 625 / reach 398 mmMoots Routt CRD (2026)size 58 · stack 624 / reach 398 mmRadon Tigard (2026)size XL · stack 625 / reach 398 mmMoots Vamoots 33 (2026)size 60 · stack 625 / reach 396 mmMoots Vamoots RCS (2026)size 60 · stack 625 / reach 396 mm
Stack and reach within 12 mm of size 61 (stack 663.9 / reach 410.9 mm).
Pelago Sibbo (2026)size 65 · stack 660 / reach 411 mmSalsa Fargo 32 (2026)size M · stack 664 / reach 407 mmSalsa Cutthroat C (2026)size 60 · stack 664 / reach 406 mmBlack Mountain Cycles Mod Zero (2026)size 59 · stack 665 / reach 405 mmSauvage LeBaroudeur (2026)size L · stack 659 / reach 407 mmCrust Bombora (2026)size XXL · stack 660 / reach 416 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