A Southern Cross Cycling Club member has pleaded with the motorist who left fellow member and friend Brendan Braid "near death" to come forward.
Mr Braid, 58, was found by a number of cyclists several minutes after being struck in a hit-and-run collision about 6.15am on Sunday near Helensburgh on Garrawarra Hill.
He was curled up beside his mangled bike with fragments of a car mirror scattered around him, and is believed to have been knocked unconscious.
Yesterday, he was in a stable condition in intensive care at St George Hospital.
The cycling club told its members via social media Mr Braid had suffered a cracked lower vertebrae, internal bleeding, a broken ankle, broken leg, and extensive grazing and bruising.
Club member and former president Phillip Kelly arrived on the scene after Mr Braid, who was riding on his own, had been taken to hospital.
He said he had passed the ambulance while riding.
"It's very bad to hear someone you ride with all the time has been involved in a hit and run accident," Mr Kelly said.
"And to see the bike ... it was totally smashed.
"Its absolutely terrible ... to leave a person like that near death on the side of the road, it's disgusting."
Two fellow cyclists were the first to come across Mr Braid and called an ambulance.
Following the incident, Southern Cross Cycling Club's Facebook page was inundated with members wishing Mr Braid a speedy recovery.
One cyclist wrote: "I got there at the same time as the ambulance and cannot believe that someone could drive off and leave someone in that condition."
Another wrote: "It's always distressing to see a cyclist being loaded into an ambulance, especially when it's someone you know."
Wollongong Acting Inspector Dan Richardson said a white Ford Laser with a Victorian registration and green P-plates had been seen in the area at the time of the collision.
He said the car was heading south and urged the driver to come forward.
"We're after any assistance from the public," he said.
Mr Kelly said Mr Braid was "conscious and talking" in hospital on Sunday but did not remember the incident.
Although roads linking Helensburgh and Sydney are popular with cyclists on weekends, Mr Kelly said the collision was unusual.
Yesterday, it was revealed Mr Braid's injuries were more serious than first believed.
Anyone who knows the identity of the driver or has information about the crash is urged to phone Crime Stoppers on 1800 333 000 or visit the Crime Stoppers online reporting page.
Also on Sunday, a 26-year-old woman was struck while she was riding a bicycle along Mamre Road, Kemps Creek, in western Sydney.
The truck driver did not stop to assist the woman.
Emergency services attended and the injured woman was taken to Liverpool Hospital where she was admitted to the intensive care unit.
Meantime, Lake Illawarra highway patrol officer Sergeant Nicholas Park urged bicycle riders to make themselves "as visible as possible" and to ensure they always wore a helmet.
He said it was important for cyclists and motorists to show courtesy to one another on roads.