The “ride out” was a show of solidarity from the capital’s rider community after moped and motorbike crime rose in recent years.
The riders were filmed massing in a car park this afternoon before they were pictured later filling Vauxhall bridge across the Thames, just a few hundred meters from parliament.
It was claimed 250 gathered outside the Palace of Westminister, parking up in the road to stop traffic, and then kneeling in a huge circle on the green and chanting.
“Massive gathering of couriers now heading to central London in a protest after today’s [death] of a colleague,” Tweeted Ray Pill, an account dedicated to tackling moped theft.
“[The victim] was attacked trying to defend his bike [from] getting stolen,” the account adding wrote.
“Heading to parliament square,” the account added shortly after.
“Go for it,” replied Danny Burnell on social media, adding: “Show that mayor that enough is enough @SadiqKhan has swept bike crime under the carpet for too long”.
“Best of luck today. It’s awful, awful news. The government/parliament had a chance to stop this ages ago but failed in it’s duty,” wrote another person on Twitter.
The tragic man concerned was a 46-year-old martial arts teacher from Brazil, who was attacked on Saturday on Charlotte Despard Avenue around 4.30pm.
It is believed he saw a gang attempting to steal his bike on the Battersea estate before as many as seven cowardly young men beat and kicked him.
An eyewitness said they kicked his head until he was unconscious and not breathing.
Cops said the attackers fled the scene before they arrived. However, the moped was not stolen and it has been recovered for forensic examination.
A 16-year-old male was arrested near to the crime scene shortly after the beating on suspicion of grievous bodily harm.
He was taken to a west London police station and has been bailed to a date in early June pending further enquiries.
London crimes using mopeds peaked at 2,592 in July 2017 and saw police turning to radical tactics including ramming suspects with their cars.
Moped-enabled crime in the capital fell by 52% last year, partly thanks to a notorious gang being jailed, the Met said earlier this month.