Advocates are pushing for a law that would force police to investigate all serious bike accidents.
CNN: Bicycle injuries: Is the right-of-way fight getting ugly?
But Mr Parry said police enquiries revealed that the bike had been sold through the eBay account of Darch's girlfriend.
Police are also keen to trace a mountain bike in connection with the investigation.
The man just promoted by the prime minister to discipline Tory backbenchers showed very little of that discipline himself when told by a police officer that he couldn't ride his bike out of Downing Street using the main gate.
It was apparent police had targeted my son while he was riding his bike home from a friend's house.
It is believed the cyclist, a white man in his 30s or 40s, went to the nearby shops and bought Mr Locke a bottle of brandy to apologise for knocking him off his bike near the shops in Rose Avenue, police said.
BBC: Adrian Locke stabbing: Appeal to trace cyclist after crash
Police are still trying to track down a teenager on a bike so he can be eliminated from their inquiries.
Police said they were looking for the owners of the quad bike.
West Mercia Police said Mr Locke, 39, had been riding his bike near Rose Avenue on the day he was murdered when he collided with another cyclist.
BBC: Adrian Locke stabbing: Appeal to trace cyclist after crash
Sgt Martyn Bougourd, a police collision investigation officer, said he calculated that the quad bike had been travelling at 32mph, within the 35mph speed limit for the road.
Police are still trying to track down a teenager seen on a bike near a house fire in Essex that claimed the lives of a mother and her five children.
Police are still trying to track down a teenager seen nearby on a bike so he can be eliminated from their inquiries.
Although New York police and the city's Department of Transportation report increasing bicyclists, the number of bike deaths has remained steady.
CNN: Bicycle injuries: Is the right-of-way fight getting ugly?
Police were alerted to Brett Webber's bizarre driving after he almost knocked a motorcyclist off his bike in the city centre last January.
Also, on Sunday, a Citi Bike was stolen as it was being delivered to a station at Second Avenue and 25th Street, police said.
Anyone who witnessed the crash between the Shark quad bike and the Range Rover, which occurred at about 1900 GMT, is asked to contact Essex Police.
The police and crime commissioner's plan to target "anti-social" cyclists in Cambridge has been criticised by bike campaigners.
Police responded by saying that he was still the registered keeper and asked for documents to prove the sale of the bike.
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