The engineering team led by head designer Lutz Scheffer at Hessian bike manufacturer Rotwild spent around two years working on the new frame design. The experience of Scheffer, a passionate e-mountain biker with a preference for alpine trail riding, played a particularly important role here. The requirements for the new E-Fully were clearly formulated: Confident, smooth steering behavior at high speeds on challenging downhills, maximum autonomy at reach height and significantly improved trail potential, both uphill and downhill.

The means to achieve this: A frame design developed from scratch with a low-slung top tube and simultaneously low-set shock should ensure the best freedom of movement and maneuverability thanks to the low center of gravity. With a 66° steering angle and 74° seat angle with a 437 mm reach in size M, the R.X750 d meets the requirements of modern, sporty geometry.

The all-carbon chassis of the R.X750 is manufactured entirely by hand. The frame uses the advantages of state-of-the-art carbon processing and is only supplemented with aluminum inserts in structurally necessary areas, such as the shock mount. A total of 62 working hours per frame are required to turn 1,046 individual carbon blanks into a finished frame that meets the ROTWILD engineering specifications.

The newly developed hollow chamber design in the head tube area provides high stability and rigidity. The integrated carbon motor housing creates a maximally rigid connection between the head tube via the down tube to the drive area to absorb all pedaling and drive forces.

The new Open Bridge Triangle design of the rear triangle (DBGM no. 202018002931.9) makes the bridge between the chainstays superfluous. The stays are connected in the main bearing in a torsion-proof and self-centering manner. This creates important space between the main bearing and rear wheel axle for the use of high-traction tires.

The engineers have fundamentally revised the 150 mm suspension for big mountain use. The 3D forged linkage design, enlarged industrial bearings and the Trunnion Mount shock mount with ball bearings protect the shock from damaging lateral forces, increase the longevity of the suspension element and the stiffness in the rear triangle. Specially designed for the shock absorber, the suspension offers a 10% higher efficiency and noticeably improved downhill characteristics in conjunction with tuned shock tunes. Uphill traction is optimized by later compression of the rear triangle when rolling over obstacles and minimization of the pedal kickback phenomenon.

The semi-integrated, powerful 750 Wh battery is housed in a compact hollow carbon down tube construction. The battery itself offers the latest cell technology (type 21700) in an unrivalled compact and robust aluminum housing. Thanks to the large frame cut-out and Quick Lock, the IPU750 can be removed in seconds; alternatively, a screw lock can be used to prevent theft.

For the motor, Rotwild relies on the Brose Drive S-Mag, which integrates perfectly into the bike with its compact installation dimensions. In Flex Power Mode, the biker can switch to a combination of torque- and speed-controlled assistance in the fourth stage, giving them up to 30% more power at a high cadence.

The wheel mix of 29er front wheel and 27.5" rear wheel combines the best of both worlds and guarantees uncompromisingly good handling of the bike. While the 29x2.4 tire at the front ensures optimum rollover behavior and less rollover feeling on descents, the 27.5x2.6 tire at the rear increases traction while maintaining agile handling. With a slightly longer wheelbase (1,198 mm, size M), the chainstay has been made even shorter at 445 mm.

The R.X750 is available in the three equipment variants Ultra, Pro and Core, each in four frame sizes S, M, L and XL. All models are equipped with the Brose Drive S-Mag and the in-house developed IPU750 as standard.

rotwild.de