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La bici perfecta para enduro eMTB. La batería integrada permite una geometría muy ágil con vainas cortas. La extraordinaria potencia de la batería permite superar fácilmente subidas y tramos técnicos. Cuadro aluminio de 165mm de recorrido. Horquilla Fox 36 de 170mm.

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6 999,00 € IVA incluído


The R.E+ FS is the perfect enduro eMTB: the compact Integrated Power Unit (IPU) allows a very responsive geometry with short chain stays; the battery is integrated into the bottom tube as a structural part and impresses with its high stiffness while maintaining a low weight. With its additional 518 Wh, the IPU offers a lot of power to overcome long, steep passages.

The Brose drive system does not generate any additional resistance after cutting out above the legal speed limit because it disengages completely. This means the bike remains easy to pedal even at speeds in excess of 25 km/h. Ensuring a direct response, a stable mean travel range and a high traction are the perfectly tuned kinematics of the R.E+, in which the influences of the drive system have been minimized and the virtual pivot points adapted to the additional motor power.






ROTWILD Integrated Power Unit (IPU)

The ROTWILD IPU consists of a Brose drive motor and the battery unit developed by us. The aim in development was to integrate the two elements completely within the bike frame in order to retain the dynamic riding characteristics (geometry and kinematics) of classical mountain bikes. The system of the IPU has been registered as a patent with the European Patent Office under Reg. No. DE 10 2013 218 004.


BROSE motor unit forms a particularly suitable basis

The pedelec electric motor developed by the German automotive supplier BROSE forms the basis for our IPU. In electrical engineering terms, it involves a “brushless internal rotor”, which is characterized by an extremely compact design combined with high efficiency. The power from the electric motor is transmitted in two stages in a ratio of 1:27. This means that the electric motor always rotates within its optimum window of revs, guaranteeing high efficiency. Another unique design feature of the Brose motor is the use of two freewheel mechanism in the interior. This is very important in the case of pedelecs with a legally prescribed cut-off speed at 25 km/h. With the aid of the second freewheel mechanism, the electric motor disengages entirely once the 25 km/h limit has been exceeded so that the rider can continue to accelerate the bike with muscle power and without any loss in forward drive.

Battery designed in collaboration with a German battery producer

We designed the battery unit in collaboration with a German battery producer. Essentially, the battery consists of four basic elements: the 40 Li-ion cells, the battery management system (BMS) with cable harness and motor connector, the integrated charging socket and the housing that encloses and protects the entire battery unit.  

The 40 high-grade lithium-ion cells of type LG INR18650MJ1 are divided into 5 packs of 8 cells each (4P10S). One single cell delivers a potential difference of 3.6 volts (range 4.2-3.6 volts) with a capacity of 3,500 mAh. The special feature of this Li-ion cell is the chemical structure on the inside, which has been specially designed for pedelec and automotive applications.

IPU integration into various bicycle designs

Our IPU is designed in such a way that we can use it in all bike categories or ranges without any great restrictions in geometry, kínematics or compatibility, i.e. from ROTWILD MTB Cross Country via All Mountain to Enduro; yet at the same also in the multifunctional Tour or Trekking Bike sector. To this end, the motor housing becomes a permanent part of the frame, firmly bolted to the bottom tube battery and unit and the frame – the bottom tube battery unit becomes a supporting element within the frame structure. The compact design additionally enables us to achieve short chainstay lengths or appropriately position the pivot points which are important for the development of full-suspension frames.


Our aim is to develop the ideal suspension system for every application in order to offer maximum dynamics and riding enjoyment. Kinematic analysis of the entire system forms the basis for our chassis development. This includes determination of the virtual pivot point as well as the wheel trajectory curve, but also the pedal kickback and the transmission ratios between rear swing arm and shock absorber.


Virtual pivot point (instant centre)

The virtual pivot point describes a point that moves through the compression process, also known as the instant centre of rotation.


Wheel trajectory curve

In addition to the position of the virtual pivot point, the wheel trajectory curve also has a crucial influence on the mountain bike kinematics. The wheel trajectory curve is determined by a straight line for the instant centre, which passes through the virtual pivot point and the axis of the rear wheel.


Pedal kickback

The pedal kickback describes the change in length of the chainstay over the spring extension phase and is determined by the direct distance between bottom bracket and rear wheel axle.


Gear transmission ratio

The transmission ratio comes from the net result of the moments, which is calculated from the forces on the rear wheel and on the shock absorber.


Multiple Dropout Inlay (MDI)

With its Multiple Dropout Inlay generations I and II, ROTWILD introduced a system which allowed different axle standards and derailleurs (Shimano Direct Mount or SRAM Standard) to be installed simply by changing the inlays. The inlays additionally provide mechanical protection when mounting or removing the rear wheel and do not cause defects to the frame in the event of damage.  

The new third generation of the MDIs (MDI III as from frame model R.X1 and R.X+, model year 2016) additionally makes it possible to set a horizontal position for the chainstay length. Consequently, taking into account the wheel size, very short chainstay lengths of 422.5 mm and medium-length chainstays of 435 mm are possible.


Horizontal length adjustment and different wheel sizes at the focus of development

Length adjustment via MDI III takes place purely horizontally. This means that important dynamic geometrical dimensions such as height of bottom bracket, seat post and head tube angle are not affected.   

The different wheel sizes of 27.5” and 27+ can also be integrated without serious modifications to the geometry. For 27+ tyres with a breadth of 2.8” to 3.0”, the increased tyre deformation in comparison to standard tyres of 27.5” means that the statically effective radius of tyre to the ground remains practically identical, and consequently the effective height of the bottom bracket does so as well.  

You will find more on settings and configuration options for the MDI III in our knowledge database.


Dynamic influences on ride of different chainstay lengths

With the forward axle position, a very short chainstay length of 422.5 mm results, which leads to manoeuvrable, sporty riding characteristics at the same time as an agile and dynamic response when cornering. The rider is able to raise the front wheel more easily on trails in order to overcome obstacles. The chainstay length of 422.5 mm with 140 mm of travel and maximum possible tyre clearance with tyres of 2.4” in width represents the benchmark in the All Mountain sector. 

In the rear axle position, the chainstay length is 435 mm – a medium-length chainstay. This axle position leads to greater riding stability on fast descents and better uphill capabilities in steep terrain, as the front wheel stay in contract with the ground for longer. At the same time, tyres with a width of up to 3.0” (27+) can be mounted with this axle position.


Axle position adjusted to rider height

With the aid of the two inlay kits and the associated chainstay lengths, it is also possible to adjust the frame to a rider’s height. To optimize the theoretical distribution of the centre of gravity, we recommend a chainstay length of 435 mm for the frame sizes L and XL; however, the short configuration continues to be an option for the two large frames as well.