EU regulation determine the power assistance allowed and the maximum stopping distance. The e-bike rules apply to two types of e-bikes.
Pedelecs (pedal electric cycle) with a max speed of 25 km/h (15.5 mph). The motor output is limited to 250 Watts – CEN 15194:2017.
S-pedelecs (speed pedelec) with a max speed of 45 km/h (28 mph). The motor output is limited to 4000 Watts – Regulation 168/2013.