What should I do if... ?

At this point we would like to give you a first aid checklist with some measures that you can check yourself in the first step. However, we would like to point out that this checklist is not exhaustive. From our experience, however, the first sources of error can already be eliminated.

We recommend, however, that you contact your dealer for any problems with the drive system of your ROTWILD E-MTB and have a complete error diagnosis carried out. An E-MTB is an electric motor-assisted bicycle that is subject to special guidelines.

Where can I obtain up-to-date information on the Brose e-Bike system?

 You will find up-to-date information and news on the Brose e-Bike system on the Brose homepage.

How and why is the e-MTB regulated/limited?

With your ROTWILD E-MTB you use a registration-free version, limited to 25 km/h, with an average rated power of 250 W. Therefore they are considered bicycles or pedelecs according to traffic law. For further information, we refer to DIN EN 15194 2017.

Can the timing belt break?

The timing belts in the Brose Drive T, Drive S and Drive S Mag are a mature technology in which the belt is matched to the application, mileage and load. Should the belt break, however, you can continue pedaling normally without further damage to the engine. 

Can the bike also be ridden when the motor is switched off or the battery is flat?

For wheels with Brose drive, this is exactly one of the main strengths. In this case, the electric and the force introduced by the driver are completely separated from each other by a freewheel between the electric motor and the chainring. This means that in off-mode, the driver does not have to move any transmissions or the rotor of the electric motor. He drives the chainring directly without losses and detours.

Is there a pushing aid?

Yeah, there's a pushing device. Please refer to the operating manual of your E-MTB for information on how to use it.

Influence of engine support on overall performance

When comparing the different drive concepts and the learned subjective feeling when riding a conventional mountain bike without an engine, different influencing factors have to be considered:

  • E-MTB typical, the tyres are designed for maximum traction and control - a higher tyre friction value can be the result
  • Higher system weight through additional drive components, E-MTB optimized components and more potent touring equipment
  • Test drives confirmed this: At 23 km/h and a slight increase (approx. 1%), the riding performance of classic MTB and E-MTB only coincide when there is a support of 40% (highly dependent on speed and cadence).

Even with identical tyre friction coefficient, cw value, air density, projected area and under the assumption that there is no wind, different final speeds can be achieved with a constant input power of 125 watts, a rider weight of 80 kg and a constant gradient of 5%:

  • MTB: Weight wheel + equipment = 16kg, P[M]= 125 W, v = 8 km/h
  • E-MTB (support off): weight wheel + equipment = 28 kg, P[M] = 125 W, v = 7 km/h
  • E-MTB (support level 4): Weight wheel + equipment = 28 kg, P[M] = 125 W, + 4.U stage, v = 25 km/h

The comparison shows how clearly the additional drive power has an effect on the speed.

The subjective feeling, which experience suggests after reaching the summit that the resistance of the pedal should decrease rapidly, is a bad amplifier. Especially after switching back from stage 4 to stage 2, about 350 watts of additional power are missing. In this example, the cadence could not be taken into account, which also has a considerable influence on the perceived resistance moment.

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