The wheel giving cyclists an extra push
A device which turns a push bike into an electric hybrid bicycle has been developed.
The Copenhagen Wheel can be attached to most bicycles and contains an onboard computer, battery, sensors and motor which respond to the rider's pedalling behaviour.
An accompanying app allows cyclists to control the level of power assistance, track their journey and share data with other users.
BBC Click's Dan Simmons finds out more.
27 Feb 2015