An industrial partnership at the heart of the electric transition
In a context of energy transition where technological innovation meets industrial expertise, the partnership betweenB2G andWEENAV perfectly illustrates how two complementary players can combine their know-how to develop high-performance electric mobility solutions. This industrial rapprochement, the result of several years of collaborative development, has led to the creation of two high-power 100% electric propulsion solutions : the KRONOS outboard motor and the ARION inboard motor from Weenav.
B2G: French excellence in mechanical transmissions
A growing specialised company
Founded in October 2020 and based in Saint-Geniès in Dordogne, B2G (Black and Green Gearbox) has established itself as the only French player to bring together all the skills related to gear reducers: design, manufacturing, repair and improvement. The company, located in the ZAE Les 4 Routes, has developed a unique expertise that is now a reference in the electric mobility sector.
A recognised know-how
The team, led by Julien Roulland (Sales Director, 18 years of experience) and Sergio Da Silva (Technical Director, 20 years of experience), has delivered over 500 new reducers and helped avoid the waste of more than 5 tonnes of material through the repair of existing reducers.
B2G's achievements demonstrate its versatility: with over 200,000 kilometres travelled by retrofitted vehicles equipped with their reducers, the company daily proves the reliability and performance of its solutions.
Strong values and institutional recognition
B2G is committed to essential values that guide its daily actions: Ambition, Respect, Proximity, Rigor, and Innovation. This corporate philosophy was recognised by obtaining the CII (Innovation Tax Credit) approval in 2025, confirming the innovative nature of its developments.
The company has also received several prestigious labels, including the Coq Vert from Bpi France obtained in the summer of 2022, reflecting its environmental commitment. B2G is part of the NA20 selection of French Tech Bordeaux for impact companies and benefited from incubation at the Refactory of Renault Group in Flins in spring 2023.
Multisector expertise
B2G reducers equip applications in many industrial sectors:
Special machines : To drive machine tools, conveyors, and other production equipment.
Energy : For any energy production equipment, particularly wind and hydroelectric.
Transport : In railway systems, lifts and other transport equipment requiring high torque.
Agriculture : For all agricultural, harvesting or food production machines.
The three pillars of B2G's activities
1. Industrial Gearboxes
B2G excels in creating custom gear reducers, meeting the specific needs of each client. The company uses advanced technologies and top-quality materials to ensure durable and high-performance products, subjected to rigorous quality control at every stage of production.
2. GRAFIT Gearboxes for Retrofit
The retrofit of thermal vehicles to electric represents a major strategic focus for B2G. Launched in summer 2023, the GRAFIT project has allowed the company to strengthen its position as a market leader in gear reducers for retrofit operations. The first road approval of a vehicle equipped with a B2G gearbox was obtained at the end of 2023, marking an important milestone in the development of this activity.
3. Maintenance of Gear Reducers
Launched in April 2021, B2G's maintenance service extends the lifespan of gear reducers and optimises their operation. This activity is part of a continuous improvement and sustainable development approach, helping to avoid waste of raw materials.
The B2G x WEENAV partnership: When expertise meets innovation
WEENAV: An innovative 100% electric motor manufacturer
A model of territorial industrial co-development
The partnership between WEENAV and B2G is part of a logic of industrial co-development between two complementary players in the energy transition within the maritime mobility sector. Drawing on its expertise in mechanical transmissions dedicated to electric propulsion, B2G has supported WEENAV from the early phases of development of the KRONOS and ARION ranges.
An innovative industrial scheme
The collaboration between the two companies results in an original and efficient industrial organisation:
Production in Dordogne: The propulsion mechanism is developed, partially manufactured, and pre-assembled in the B2G workshops in Saint-Geniès, Dordogne.
Final assembly in the Hauts-de-France: The mechanical assemblies are then shipped to the WEENAV facilities for final assembly and system integration.
This model allows for the enhancement of local expertise while ensuring agility, proximity, and a gradual increase in quality. It perfectly illustrates how interregional collaboration can create value while respecting territorial know-how.
The KRONOS and ARION range: 100% electric high-performance drive solutions
After several months of collaborative development, the partnership between WEENAV and B2G has resulted in the creation of 100% electric outboard and inboard motorisation solutions.
The KRONOS range and the ARION range represent the culmination of this collaboration, combining B2G's expertise in high-performance mechanical transmissions with WEENAV's know-how in systems of electric propulsion.
A shared vision for the mobility of tomorrow
Environmental commitment at the heart of the project
From the commercial aspect to the design and construction phases, all of B2G's reflections are dictated by respect for the planet. The company is committed to contributing to environmental preservation through its actions, designs, and services. This philosophy aligns perfectly with WEENAV's vision of a 100% electric mobility.
A trusted and long-term partnership
The success of this partnership relies on several key factors:
The complementarity of expertise : B2G brings its know-how in mechanical transmissions, WEENAV its expertise in maritime and river electric propulsion systems.
Mutual trust : After months, even years of development, the two companies have managed to build a strong relationship based on trust and mutual respect.
A shared vision : The two players share the same ambition to actively contribute to the energy transition in the mobility sector.
Industrial agility : The production model distributed between Dordogne and Hauts-de-France allows for optimal responsiveness and a gradual increase in quality.
Future prospects
This partnership opens promising prospects for both companies. WEENAV is already planning to strengthen its workforce to support the industrialisation and marketing of its solutions, while B2G continues to develop its expertise in transmissions for electric marine applications.
The industrialisation of the range marks an important step in the development of the electric marine mobility in France. It demonstrates that French technological excellence, combined with intelligent industrial organisation and shared values, can produce innovative and high-performance solutions.
Conclusion
The partnership between B2G and WEENAV perfectly illustrates what French industrial collaboration can achieve in the field of energy transition. By combining B2G's recognised expertise in gear reducers with WEENAV's innovation in electric propulsion, the two companies have created a solution that meets performance requirements while respecting the environment.
This beautiful demonstration of what a trusted partnership and a shared vision can achieve inspires and paves the way for other virtuous collaborations in the sustainable mobility sector. B2G thus continues its mission to support the transition to a more responsible industry, bringing its technical expertise to innovative and environmentally friendly projects.
contact@b2g-gearbox.com
07 87 31 58 09
80 Le Grand bois – ZAE Les 4 Routes, 24590 Saint-Geniès, France
Published on 24/12/2025
Editor: Sophie Castelain