An industrial partnership at the heart of the electrical transition
In a context of energy transition where technological innovation meets industrial expertise, the partnership between B2G and WEENAV perfectly illustrates how two complementary actors can combine their know-how to develop high performance electric mobility solutions. This industrial alliance, the result of several years of collaborative development, resulted in the creation of two solutions for 100% electric high power motorization : the KRONOS outboard motor And the ARION inboard motor by Weenav.
B2G: French excellence in mechanical transmissions
A fast-growing specialized 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 combine all the skills related to speed reducers: design, manufacturing, manufacturing, repair and improvement. The company, located in the ZAE Les 4 Routes, has developed a unique expertise that is now a reference in electric mobility sector.
Recognized expertise
The team, led by Julien Roulland (Sales Director, 18 years of experience) and Sergio Da Silva (Technical Director, 20 years of experience), delivered more than 500 new reducers and contributed to the avoidance of the waste of more than 5 tons of material by repairing existing reducers.
B2G's achievements attest to its versatility: with more than 200,000 kilometers covered by retrofitted vehicles equipped with their reducers, the company proves the reliability and performance of its solutions on a daily basis.
Strong values and institutional recognition
B2G is committed to essential values that guide its daily actions: Ambition, Respect, Proximity, Rigor and Innovation. This business philosophy was recognized by obtaining 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 summer 2022, attesting to its environmental commitment. B2G is part of the NA20 selection of French Tech Bordeaux of impact companies and benefited from an incubation at the Renault Group Refactory in Flins in spring 2023.
Multisectoral expertise
B2G reducers equip applications in numerous industrial sectors:
Special machines : To drive machine tools, conveyors, and other production equipment.
Energy : For all energy production equipment, especially wind and hydroelectric.
Transport : In rail systems, elevators, and other transport equipment that requires high torques.
Agriculture : For all agricultural, harvesting or food production machines.
B2G's three business pillars
1. Industrial reducers
B2G excels in creating tailor-made speed reducers, meeting the specific needs of each customer. The company uses advanced technologies and first-class materials to guarantee durable and high-performance products that are subject to rigorous quality control at each stage of production.
2. GRAFIT Retrofit reducers
The retrofit of thermal electric vehicles represents a major strategic axis for B2G. Launched in summer 2023, the GRAFIT project allowed the company to strengthen its leading position in the market for reducers for retrofit operations. The first road approval for a vehicle equipped with a B2G gearbox was obtained at the end of 2023, marking an important step in the development of this activity.
3. Speed reducer maintenance
Launched in April 2021, B2G's maintenance service makes it possible to extend the life of reducers and optimize their operation. This activity is part of a process of continuous improvement and sustainable development, helping to avoid the waste of raw materials.
The B2G x WEENAV partnership: When expertise meets innovation
WEENAV: An innovative 100% electric engine 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 energy transition in the maritime mobility sector. With its expertise in mechanical transmissions dedicated to electric motorization, B2G supported WEENAV from the very first stages of development of KRONOS and ARION range.
An innovative industrial scheme
The collaboration between the two companies results in an original and efficient industrial organization:
Production in Dordogne : The propulsion mechanism is developed, partly manufactured and pre-assembled in the B2G workshops in Saint-Geniès in Dordogne.
Final assembly in Hauts-de-France : The mechanical assemblies are then shipped to WEENAV facilities for final assembly and system integration.
This model makes it possible to promote local expertise while guaranteeing agility, proximity and gradual improvement in quality. It is a perfect illustration of how interregional collaboration can create value while respecting territorial expertise.
The KRONOS and ARION range: 100% electric high performance motorization solutions
After several months of collaborative development, the partnership between WEENAV and B2G resulted in the creation of solutions for 100% electric outboard and inboard motorization.
La 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 tomorrow's mobility
Environmental commitment at the heart of the project
From the commercial part to the design and construction phases, all B2G's thinking is dictated by respect for the planet. The company is committed to contributing to the preservation of the environment through its actions, designs and services. This philosophy is perfectly in line with WEENAV's vision of a 100% electric mobility.
A long-term and trustworthy partnership
The success of this partnership is based 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 been able to build a solid relationship based on trust and mutual respect.
A shared vision : Both actors share the same ambition to actively contribute to the energy transition in the mobility sector.
Industrial agility : The production model divided between Dordogne and Hauts-de-France allows optimal reactivity and a gradual increase in quality.
Future perspectives
This partnership opens up promising prospects for both companies. WEENAV already plans to strengthen its workforce to support the industrialization and marketing of its solutions, while B2G continues to develop its expertise in transmissions for marine electric applications.
The industrialization of the range marks an important step in the development of maritime electric mobility in France. It shows that French technological excellence, combined with an intelligent industrial organization and shared values, can produce innovative and efficient solutions.
Conclusion
The partnership between B2G and WEENAV perfectly illustrates what the French industrial collaboration can accomplish in the field of energy transition. By combining B2G's recognized expertise in speed reducers with the innovation of WEENAV by electric motorization, the two companies created a solution that meets performance requirements while respecting the environment.
This great demonstration of what a trusting partnership and a shared vision can achieve inspires and paves the way for other virtuous collaborations in the sustainable mobility sector. B2G is thus pursuing its mission of supporting the transition to a more responsible industry, by bringing its technical expertise to the service of 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
www.b2g-gearbox.com
Posted on 24/12/25
Editor: Sophie Castelain
