London Cycling Campaign is warning internet sites which don't require identification are becoming popular for thieves selling on bikes. Often, a thief won't post a real photo of the bike, and will expect a quick sale, often conducted by mobile phone and on a street corner or outside a pub.
The London Cycling Campaign is to hold its second protest in a week, following the death of a man in Holborn.
Around 1,500 cyclists took part in the last protest ride from Tower Hill to Aldgate, which aimed to highlight the lack of separate cycle lanes on some of the capital's busiest roads.
This evening's protest begins at 6.30pm at Russell Square.
Cycle campaigners are demanding better safety measures in London once again, following the death of another cyclist.
The man, said to be in his forties, died after colliding with a lorry outside Holborn Tube Station this morning.
The lorry-driver has been arrested. Nick Thatcher reports
A cycling campaign group has organised a protest ride in the wake of the death.
The London Cycling Campaign sent their "deepest sympathy to family and friends of the latest victim."
It will take place tomorrow at 6.30pm, starting at Russell Square.
So far this year four cyclist have been killed on London's roads.
That's compared to 14 deaths in total last year - a figure which represented a 13% drop on the year before.
There were also 657 serious injuries last year, though no comparable figure has yet been compiled for this year to date.
20-year-old Boris Bike user Philippine Degerin-Ricard was killed in a collision with a lorry in Whitechapel last weekend.
Now campaigners say the section of the cycle superhighway on Whitechapel Road where she died needs urgent improvement to make it safe.
Whitechapel Road facts:
- 1,100 lorries use the route everyday.
- In all 30,000 vehicles travel on Whitechapel Road everyday.
- 600 cyclists pass through every hour.
These figures are from the London Cycling Campaign.
There have been new calls for urgent action to improve one of east London's main cycling routes, following the death of a 20-year-old student last weekend - the first to be killed on a Boris bike.
Protesters from the London Cycling Campaign are riding from Tower Hill to Aldgate tonight to highlight their fears that Superhighway 2 is too dangerous.