Stroke survivor Tommy Quick left with broken bones after being hit by car during charity ride

Tommy Quick has a shattered pelvis and broken femur after being hit by a car. (ABC News: Evelyn Leckie)

A stroke survivor who was cycling across Australia on a recumbent trike to raise money for stroke support services has been hit by a car, leaving him with a shattered pelvis and a broken leg.

Tommy Quick was part way through a 9,000-kilometre ride when he was hit by a car in South Australia's Barossa Valley region on Wednesday.

Mr Quick has posted an Instagram video from an Adelaide hospital bed, saying he was "feeling alright" despite the accident.

Aiming to cycle around mainland Australia's "most extreme" westerly, southerly, easterly and northerly points, Mr Quick set off from Steep Point in WA earlier this year.

Mr Quick wanted the "4 points Australia" ride to raise funds as well as awareness about young survivors of strokes.

He was about 10 kilometres from the South Australian town of Nuriootpa when the crash happened.

Mr Quick will undergo surgery in an Adelaide hospital. (Instagram: 4pointsaustralia)

As well as a shattered pelvis, Mr Quick has also broken the femur in his right leg.

Mr Quick said while it was a significant setback, he would not be giving up.

"Putting it bluntly, it's pretty shit, but it's just another hurdle in the road I've got to cross," he said.

"There might need to be a few modifications or improvements, I've got to get a new trike. 

Mr Quick was just 12 years old when he suffered from a stroke.

Since then, he has set himself several challenges, including this latest ride across Australia.

His father Clive Quick and mother Rena Fisken were riding behind Mr Quick in a support vehicle when the accident happened.

Tom's father Clive Quick and mother Rena Fisken were riding behind him at the time of the accident.

Ms Fisken said she could still picture the accident.

"Horrifying would be the simplest way of putting it," Ms Fisken said.

"You just don't expect someone to lose control of their vehicle and when they do, hit a defenceless cyclist.

"We didn't need this and he didn't need this and I know the guy, he was very distraught, who hit him, and I feel really sorry for him … I know he won't be feeling good."

Mr Quick, who hails from Melbourne, will be having surgery at the Royal Adelaide Hospital tomorrow morning.

His family hope he can be flown back home to begin his lengthy road to recovery, which will take more than six months.

But Mr Quick is vowing to resume the ride, aiming for 2023.

"Probably I'd take the back roads a lot more now," he said.