German engineering company Hörmann Vehicle Engineering has unveiled a concept that directly addresses one of the most persistent bottlenecks in hydrogen powered agricultural machinery: onboard fuel storage. Instead of relying on traditional chassis mounted tanks, the company has developed a system that integrates hydrogen storage directly into the rear wheels of a tractor, effectively turning unused structural volume into functional energy capacity.
Wheel integrated hydrogen storage system solves space constraints in tractor design
From an engineering standpoint, hydrogen has always faced a packaging problem in off road machinery. High pressure tanks are bulky, and placing them within the tractor frame often forces compromises in weight distribution, visibility, or implement compatibility.
Hörmann’s approach is structurally different. The system places a ring shaped carbon fiber hydrogen tank inside the rear wheel rim, operating at 700 bar, which aligns with current European standards for high pressure hydrogen storage. By relocating the storage to the wheels, the concept avoids major redesign of the tractor chassis while preserving ground clearance and machine balance.
The system can store up to 42 kg of hydrogen, which the company estimates to be roughly equivalent to around 200 liters of diesel in usable energy. In practical terms, that translates into a full working day of operation without refueling, putting hydrogen powered tractors into a realistic parity scenario with conventional diesel machines.
A protective outer cover is integrated to shield the tank from debris, dust, and mechanical damage, which is critical given the harsh operating environment of field machinery.
Compatibility with H2 ICE and fuel cell tractors expands application potential
One of the more strategic aspects of this development is its flexibility across different hydrogen powertrain architectures.
The storage system is designed to work with both hydrogen internal combustion engine tractors and fuel cell electric platforms. This dual compatibility is important because the industry has not yet converged on a single dominant hydrogen pathway.
H2 ICE solutions are currently closer to market adoption due to their similarity to diesel engines and lower system complexity. Fuel cell systems, on the other hand, offer higher efficiency but require more advanced infrastructure and cost reductions.
By remaining powertrain agnostic, Hörmann positions this solution as a modular component rather than a niche technology tied to one specific approach.
Market impact and industry implications for hydrogen powered agricultural machinery
From a market perspective, this concept targets a very specific barrier that has slowed hydrogen adoption in agriculture: operational practicality.
Range anxiety and refueling logistics are major concerns for farmers. A system that can deliver diesel equivalent autonomy without increasing machine size or compromising usability removes a key friction point.
If validated in real world conditions, wheel integrated hydrogen storage could influence how OEMs approach alternative fuel platforms. Instead of designing entirely new tractor architectures, manufacturers may be able to retrofit or adapt existing platforms more efficiently.
However, there are still critical challenges that will define its success:
- Durability under long term field stress, including vibration, impacts, and temperature cycles.
- Safety considerations associated with high pressure hydrogen storage in rotating components.
- Cost of carbon fiber tank production at scale.
- Availability of hydrogen refueling infrastructure, especially in rural regions.
The concept also aligns with a broader trend toward decentralized energy production. Hörmann highlights the potential of on farm hydrogen generation, particularly through biogas conversion systems. If this ecosystem develops alongside storage solutions, it could create a closed loop energy model for certain farm types.
Outlook for hydrogen integration in off road equipment
This development signals a shift from theoretical hydrogen discussions toward practical engineering solutions tailored to agricultural constraints.
While battery electric tractors remain limited by energy density and charging time in high power applications, hydrogen continues to position itself as a viable pathway for heavy duty and long duration field work. Innovations like wheel integrated storage do not solve the entire hydrogen equation, but they address one of its most tangible engineering limitations.
The next phase will depend on field validation, partnerships with tractor manufacturers, and integration into broader hydrogen supply chains.
About Hörmann Vehicle Engineering
Hörmann Vehicle Engineering is part of the Hörmann Group, a German industrial conglomerate with a long standing presence in automotive engineering, manufacturing, and infrastructure solutions. The group employs over 6,000 people worldwide and generates annual revenues exceeding €1 billion.
Within the group, Hörmann Vehicle Engineering focuses on the development of specialized vehicle systems, lightweight structures, and alternative powertrain solutions, working across automotive, commercial vehicle, and increasingly off road sectors such as agriculture.
Earlier, we also reported on Kubota’s hydrogen powered tractor concept showcased at Expo 2025 in Osaka, highlighting another direction in the development of hydrogen solutions for agriculture.
