POLICE have identified an elderly cyclist found with serious injuries lying on the road at Henley Beach but still need the public’s help to work out what happened to him.

Thanks to several phone calls overnight police have identified the cyclist as an 89-year-old from West Lakes.

Police and paramedics rushed to Cudmore Tce, near the Henley Beach Rd intersection, after receiving reports of the man collapsed on the road about 8am on Saturday.

The cyclist was taken to the Royal Adelaide Hospital with serious head injuries.

It is not clear how he came off his bicycle.

If anyone saw him near the intersection of Cudmore Terrace and Henley Beach Road or may have seen him fall from his bike, they are asked to call Crime Stoppers on 1800 333 000.