690 thefts have been reported in six months - and the problem has grown each month.
The route covers 60 miles from the White Water Centre in Waltham Cross, north London to Jesus Green in Cambridge on Sunday (July 25).
He sold £600 bike for between £20 and £30.
A last-ditch protest to try to persuade councillors to reopen the bridge to cars is being organised by traders who say their livelihoods depend on it.
The incident happened on Histon Road.
Taskforce created to tackle £1.5m issue as Cambridge is confirmed as UK’s worst for the crime.
It is part of the ongoing trail project.
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A series of bike thefts took place over a weekend.
Cambridgeshire County Council said it had large numbers of duplicate entries.
Group founder Omar Terywall says Cambridgeshire police have also stepped up their efforts.
70% of cyclists said it caused problems - while disabled people said it dissuaded them from visiting the city centre
Detailed work for each of the 12 routes will get under way.
They have demanded the Cambridge bridge is reopened immediately.
Ambitions for a destination venue for outdoor activity between Milton and Waterbeach