Rotwild R.EX Ultra: A High-Performance Electric Mountain Bike Redefining Trail Dynamics
The electric mountain bike market continues to evolve, with manufacturers pushing the boundaries of performance and innovation. Enter the Rotwild R.EX Ultra, a cutting-edge e-MTB that promises to deliver an exceptional riding experience for trail enthusiasts seeking a sophisticated and powerful machine.
Motor and Power System: Innovative DJI Technology
At the heart of the R.EX Ultra lies the groundbreaking DJI Avinox M1 motor, a powerhouse that sets this e-bike apart from its competitors. Delivering an impressive 105 Nm of torque, with peak bursts up to 120 Nm in Boost mode, the motor represents a significant leap forward in electric mountain bike propulsion. The latest software update enables a continuous 1,000 watts of power in Turbo mode, providing riders with extraordinary performance across varied terrain.
Rotwild has developed a custom 864 Wh battery specifically designed for seamless integration with the DJI motor system. Weighing approximately 3.6 kg, the battery utilizes advanced 21700 cell technology, offering an optimal balance between weight and energy capacity. The removable battery features a unique quick-release mechanism, allowing for easy charging and transportation.
Frame Design and Suspension: Engineering Excellence
The R.EX Ultra showcases Rotwild’s engineering prowess through its innovative “Elevated Box Design” suspension architecture. This mid-high-pivot rear suspension configuration combines the best attributes of traditional four-bar linkages with advanced suspension geometry. The raised main pivot point enables more sensitive suspension performance while maintaining efficient pedaling characteristics.
Constructed from full carbon fiber, the frame achieves an impressive balance of lightweight design and structural integrity. The asymmetrical chainstay configuration and elevated swingarm contribute to the bike’s remarkable lateral stiffness and responsive handling. In size large, the complete bike weighs just 23.2 kg, positioning it as a remarkably lightweight option in the high-performance e-MTB segment.
Component Highlights: Premium Performance
Rotwild has equipped the R.EX Ultra with top-tier components that complement its advanced frame and motor design. The suspension package features a FOX 36 FLOAT Factory fork with 160 mm of travel and a FOX FLOAT X Factory rear shock providing 150 mm of travel. These premium dampers offer extensive adjustability and exceptional trail performance.
The drivetrain features a SRAM XO Eagle AXS Transmission, delivering precise and reliable electronic shifting. Powerful SRAM MAVEN Silver four-piston brakes with 200 mm rotors ensure confident stopping power in challenging trail conditions. The mullet wheel configuration—29-inch front and 27.5-inch rear—provides an optimal balance between rollover capability and maneuverability.
Trail Performance: Agility and Efficiency
On the trail, the R.EX Ultra demonstrates remarkable versatility. The steep 78-degree seat angle creates an efficient climbing position, while the DJI motor provides strong support even at lower cadences. Riders can navigate technical ascents with confidence, maintaining excellent traction and momentum.
Descending reveals the bike’s true character. The suspension setup strikes a balance between sensitivity and support, effectively absorbing smaller trail irregularities while maintaining stability at higher speeds. The bike’s geometry encourages an active riding style, allowing riders to carve through tight corners and navigate challenging terrain with precision.
Practical Considerations and Market Positioning
With a starting price of €11,490 for the top-spec Ultra model, the R.EX Ultra represents a significant investment for serious trail riders. However, the comprehensive specification, innovative technology, and exceptional performance justify its premium positioning. Rotwild offers two additional build options—the PRO at €9,990 and the CORE at €8,990—providing more accessible entry points to this advanced platform.
Conclusion: A Trail-Blazing E-MTB Experience
The Rotwild R.EX Ultra emerges as a sophisticated electric mountain bike that successfully integrates cutting-edge motor technology, advanced frame design, and premium components. While it may not be the ultimate choice for riders seeking maximum composure in extremely rough terrain, it excels as a versatile trail machine that delivers an engaging and efficient riding experience.
For the discerning e-MTB enthusiast who values innovation, performance, and refined engineering, the R.EX Ultra represents a compelling option that pushes the boundaries of electric mountain bike design.