Marten Hiemstra
Industrial Designer with 10+ years experience in the bicycle/mobility industry.




Batavus Mambo
2019
The Mambo was designed to be tough, capable and affordable, while also having the ability to transform into a sleek, non-stigmatising city bike. Created to support families through the early stages of parenthood, it combines everyday practicality with a clean, accessible design. Nominated for Fiets van het Jaar 2023 and featured at the NEMO Science Museum in Amsterdam.
Responsibilities
Responsible for the conceptualisation and industrial design of the frame and carrier, including the development and prototyping of a new cable-routing solution through the head tube. Also contributed to the team's consumer research.







Batavus PACKD
2019
A bicycle and e-bike platform designed for school-age children, combining a traditional silhouette with a playful character. The carriers feature a clean appearance with concealed fasteners, an integrated bungee strap to secure belongings and customizable wooden inserts. The platform comprises low-step and high-step frame designs, with six frame sizes and an electric variant. The bicycle was also featured in the Dutch movie Engel.
Responsibilities
Consumer research, concept development and industrial design of the frame and carriers.







Batavus Altura | Sparta C-Grid | Winora Tria
2019 | 2024 frame update
A multi-brand e-bike platform developed for Batavus, Sparta, Winora and Raleigh, with high production volumes. The platform features a shared frame architecture with a large gravity-cast downtube and integrated motor mount. Two sets of interchangeable covers for the head tube, motor and battery allow the same frame platform to accommodate the distinct identities of each brand.
Responsibilities
Concept development and lead designer. Industrial design of the head tube, featuring integrated cable routing, downtube, motor bracket and rear carrier. Design of the motor, battery and headtube covers.




Sparta D-Rule
2018
The D-Rule is a bicycle platform featuring a Bosch on-tube PowerPack battery, with both low-step and high-step frame designs. The low-step version combines a low and wide step-through with a high-mounted battery, making the PowerPack easy to charge, remove and reinstall.
Responsibilities
Industrial design of the downtube, toptube and rear carrier.




Batavus Fonk II
2023
The Batavus Fonk was an existing bicycle platform that underwent a complete design overhaul. Every design decision was reassessed, refining the geometry, front lighting, cable routing and user interfaces while preserving the bike's light and clean character. The rear carrier was also redesigned, and a front carrier was introduced as an optional feature.
Responsibilities
Industrial design of the frame, rear and front carriers, headlight and cable interfaces.
© 2026 Marten Hiemstra
