The cyclist fell into an area of trees, loose branches and rocks.
"He wasn't conscious but was breathing when I got down there."
A couple touring Hawke's Bay in a campervan had also seen the mountain biker fall.
They were walking down the road from the top of the peak and saw the man loop around the first track before coming back to do the second one.
"Next thing you just see his bike lost before him and he drops off. It didn't look good at all."
Ambulance staff rushed to the man and moments later the rescue helicopter arrived.
The decision was made to winch him up.
Young mountain bikers were coming down the peak as the accident happened and said they rode the path all the time.
"It is a tight corner but because I do it lots it isn't too scary," one boy said.