The Free Wilders, who are travelling the length of Britain, are liaising with police following the incident in Perthshire.
Two fundraisers taking on a naked cycle across the UK to raise money for charity have said they were left terrified after being deliberately knocked off their tandem in Scotland.
Colin Unsworth and Sadie Tan, known as the Free Wilders, were riding near Bridge of Earn in Perthshire when they were targeted.
The incident reportedly took place shortly after the car's female passenger shouted abuse at them.
The couple are cycling the length of the UK to raise money for rewilding and mental health charities.
Police are now trying to trace those involved after the couple were left with minor injuries on their journey from John O'Groats to Land's End.
Mr Unsworth said his fellow fundraiser had been filming a Facebook Live video when the pair were targeted.
Speaking to BBC Scotland Drivetime, he said: "The car has driven in the opposite direction, and then they've turned round and come after us.
"They've caught us up, shouting and swearing out the window, and took two swerves toward us.
"The second swerve they collided with us and knocked us on the floor, which is quite terrifying."
The pair have now said they have suffered with sleepless nights as a result, but that police are taking the incident seriously.
Mr Unsworth added: “They're even talking about potential attempted murder, because there's clear video evidence they've turned round and come back after us.
"I think the worst injury is the emotional one, where you're sort of scared of getting back on your bike, it kind of knocks you for six.
"We've ended up downgrading the ride a little bit to just doing little naked sections and photo shoots at famous landmarks like Edinburgh Castle.
"Just because we're a bit terrified, to be honest."
A Police Scotland spokesman told BBC Scotland: "Inquiries are ongoing after a 52-year-old man and a 31-year-old woman who were riding a tandem bike were deliberately driven at and struck by a car on the A912 near to Bridge of Earn at about 14:00 on 4 July.
"They did not require hospital treatment. The investigation to trace the vehicle and its driver is continuing."