The calculation of the speed is mainly done by considering the circumference of the wheel, knowing that the larger the wheel, the faster the vehicle “advances”. It is not only a question of counting the number of turns made by the magnet around the axis of the wheel.

Two elements make up this E-Bike specific measuring element: the sensor itself placed on one of the frame bases and a magnet placed on one of the spokes of the rear wheel. Once these bikes are tuned, they will only have access to a private or specifically dedicated area, such as a mountain bike course in a fenced area for example. This leads to the withdrawal of its approval and therefore to its banning from circulation. But for this E-Bike class, any modification made (later) to the engine or the assistance system is illegal. They can also circulate on public roads without conditions. Since they must have a motor of 250W maximum, they are legally considered as classic bicycles without a motor.

e-bikes up to 25 km/h that can be tuned are called “approved” and not considered mopeds (as in Canada, for example, the speed limit with assistance is 32 km/h).

But they are entirely subject to the Highway Code, carrying all the conditions related to the use of this type of vehicle: helmet, license, registration, possession of a valid two-wheeler insurance… These high-powered bicycles are legally assimilated to mopeds and can circulate on public roads.

Speed Bikes that have a maximum speed of 45km/h or more, and therefore normally do not require any tuning.

This way, he can know the speed engaged by the bike and automatically cuts the assistance when the 25km/h threshold is reached.ĭerestricted (tuned) electric bikes and speed bikes: what does the regulation say ? The legislation in Europe distinguishes 2 categories of e-bikes according to their initial maximum speed :

The controller receives the data and compares it with the information natively stored in its system, namely the wheel circumference and the 25km/h limit.

This device measures the frequency of the circulation of the magnet at the same level as the sensor and transmits it to the controller.

Before unrolling the whole tutorial, know that there exists a website seller of tuning kits : Here is how tuning works in practice :Ī sensor is placed on the frame symmetrically to a magnet placed on one of the spokes of the rear wheel.

Bosch e bike software tuning