Bikers are to take part in a rally as a mark of respect for the 52 victims of the London bombings.
Up to 10,000 people from across the UK will gather in central London on Sunday, before visiting the four 7 July bomb sites where wreaths will be laid.
The Unity Ride sets off from Regent's Park at noon before making its way to Edgware Road, Tavistock Square, King's Cross and Aldgate East.
Riders will then stop on Victoria Embankment for a minute's silence.
'Stronger and united'
The Unity Ride had been organised by the London Bikers organisation.
A message on its website reads: "This is a time when we all should come together when even those that were not directly affected by the bombings should show unity with the people of London in defying terrorism.
"We should show by a mass display that London is not destroyed by these acts but made stronger and more united."
Richard Olliffe, of the British Motorcyclists Federation (BMF), said: "There is no better way for the biking community to respond to recent events in London than to come together to show solidarity with and support of victims of the bombings."