Cyclists across Britain are ditching their lycra, shorts and sweat-proof vests, setting off in the buff instead to raise awareness of their vulnerability on the roads.
The event is run by Cycling UK as part of their Bike Week.
GB News' Stephen Dixon and Anne Diamond spoke to comedian Elle Bert, who has previously taken part in naked rides, and said the eyebrow raising spectacle was "to highlight all of the issues that we have around cycling.
Naked cyclist and comedian Elle Bert
Elle Bert
Bike riders across London are stripping down and riding off from eight separate locations across the Capital, including Victoria Park, Croydon, Clapham Junction, Regents Park, Tower Hill and Kew Bridge.
There is also a no-clothes cycle ride taking place in Brighton.
Meanwhile the West Midlands and Coventry have already hosted theirs.
Ms Bert told Stephen and Anne: "We want real rights.
"The reason we do it naked is because it gets people talking about it."
Asked about the responses of onlookers, Ms Bert said: "The reactions are what make it to be honest.
Nake cyclist and stand-up Elle Bert
Elle Bert
"I start in Kew and in that area people are awfully shocked."
By the time the cyclists reach central London, hoards of nude pedal pushers take over the city.
Nake cyclist and stand-up Elle Bert
Elle Bert
Ms Bert continued: "As soon as you start getting closer, it gets really busy.
We're talking in the thousands when you get into central London.
The stand-up emphasised to Stephen and Anne that the naked event isn't sexual or designed to make people feel uncomfortable.
"It's not a sex thing, it's not a prude thing - it's a lot of fun", she said.