The Brompton Electric C Line is a pedal-assisted bicycle (also referred to as Pedelec or EPAC).
The electric motor is powered by a rechargeable battery and gives extra assistance until 25 km h/15.5mph, whilst the rider is pedalling. The amount of assistance depends on certain factors: the speed of the bike, the pedal speed and the power input into the pedals.
The bike has an in-built speed and torque sensor in the bottom bracket to measure these factors accordingly.
Further information regarding the Brompton range and options can be found here.
All Brompton C Line models available can be purchased here.