Inspirium
World speed record motorcycle. Class 350APS-VG, Bonneville Salt Flats. Vintage 1953 IZH-49 platform.
Geometric was never meant to be just a custom motorcycle with an unusual appearance. It was conceived as a fully authored concept — a motorcycle in which shape, mechanics and visual rhythm all follow one clear internal logic. In Iron Custom Motors' own words, it is the materialized fantasy of a dreamer-engineer, brought to life in the pure language of retro-futurism.
The project achieved 4th place at the AMD World Championship of Custom Bike Building 2018 in the Retro Modified class. For a custom project, this is more than a result — it is confirmation that the motorcycle was recognized on one of the most respected stages in the international custom world.
The most iconic engineering feature of Geometric is its front wheel — the world's first spoked hubless wheel. This single solution is enough to make the motorcycle instantly recognizable. Combined with an early-production IZH-Jupiter engine integrated into an extremely compact architecture, a fully handmade dual-row chain, and custom sprockets — Geometric becomes a project where every part contributes to one consistent image.
For Iron Custom Motors today, Geometric remains one of the strongest examples of concept-driven custom work. It demonstrates the studio's capacity to think beyond categories and to execute motorcycles that challenge ordinary expectations not only aesthetically, but structurally.








This build explains the standard behind the Cascais workshop today: disciplined engineering, visual taste, documentation and the ability to solve unusual motorcycle problems.
Explore the portfolio, discuss a custom idea, or connect this experience to service, parts and upgrades.
World speed record motorcycle. Class 350APS-VG, Bonneville Salt Flats. Vintage 1953 IZH-49 platform.
World champion café racer. Hand-built three-cylinder engine. AMD World Championship 2016 winner.
Sturmvogel added a new Portuguese result to its history: 2nd place in the Café Racer category at Ericeira Kustom Fest 2026.
14 builds, one page each: AMD World Championship winners, BMW Motorrad 2023 champion, Bonneville record.
Whole projects only: concept, engineering on paper, budget and timeline in writing. Consultation is free.
Rider lounge: championship bikes, Bonneville trophies, coffee and conversation — no appointment needed.
WhatsApp first: +351 917 961 230, Tue–Sat 10:00–18:00, four languages. São Domingos de Rana, Cascais.
Each project is documented as an engineering and brand reference, not just a gallery item.
Retro-Futurist · AMD 2018
The public result or recognition attached to this motorcycle.
Retro-Futurist · AMD 2018
The technical or cultural class this project belongs to.
AMD World Championship 2018 · Cologne
Where the project lived, competed, was shown or became part of the Iron Custom Motors story.
Iron Custom Motors is now in Cascais. Same engineering team, same standard. Service, parts, custom builds.