This yearâs Dunwich Dynamo was perfect: a dry, moonlit night, a tail wind and a hot sunny morning on the beach. Around 500 people enjoyed the sixteenth edition of the classic British night ride that covers some 120 miles (190 kilometres) through north east London, Essex and Suffolk. But you donât have to wait until the next Dunwich Dynamo on 4 July 2009 for a sublime overnight bicycle experience, as Grant Peterson of Rivendell Bicycle Works explains.