It is NOT however, a bicycle anymore.
It is now a moped.
Hmm, 50kms in 1 hour equates to approximately 30mph which does sound like a
moped type speed
and this would tend to mandate a license, a crash-helmet, insurance, vehicle excise duty, MOT, lights, indicators, etc
However, in the UK at least, if an electrically assisted bicycle meets the following rules
https://www.gov.uk/electric-bike-rulesthen it is
not classed as a
moped but is instead classed as an
electrically assisted bicycle at least from the vehicle legal stand-point.
There is however still the interesting question about whether it is regarded as a true bicycle from the
insurance perspective
because there are certainly insurance policies that cover bicycles but not
electrically assisted bicycles.
Ian W.