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The Dirty Goose

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Features

- Mountain bike designed for a 5'9" rider

- 240 mm 31.6 mm dropper seat post

- Road narrow cranks (145 mm Q factor)

- Frame fits 29" x 2.35" tires (ETRTO 60-622) on 30 mm wide rims

- Titanium handlebars with steel stem for shock absorption

- Flat mount 160 brake mount

- 12 x 142 mm rear hub

- UDH (Universal Derailleur Hanger)

- Custom SRAM 8-bolt / 110 BCD / +3 mm offset PVD-RSD chainring spider

- Custom FM-160 to PM-180 brake adapter

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Geometry

- Front center: 808 mm

- Rear center: 405 mm

- Head angle: 69°

- Effective seat tube angle: 74.3°

- Bar sweep angle: 16° on a 20° plane (above horizontal)

(See diagram for more details)

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Design + Construction

- Custom chain stay yoke, seat stay yoke, and dropouts were designed, then 3D-printed from stainless steel

- Frame tubes: internally-butted 4130 chromoly

- TIG welded

- Chainring spider + brake adapter: CNC machined

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Completed September 2025

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Dirty dirty goose

How'd you get so dirty, goose?

Rolling in the dust

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