A cyclist has been rushed to hospital in a critical condition after coming off a bike on a Mount Coot-tha track on Sunday afternoon.

The man was riding along the Kokoda Trail, a steep 900-metre track on the Kenmore Hills side of the mountain forest, when the incident happened.

A Queensland Ambulance Service spokesman said paramedics were called to the track just before 4pm.

The man had rolled down the track about 10 metres and suffered serious head injuries, the spokesman said.

He was transported in a critical condition with critical care paramedics on board to the Royal Brisbane and Womens' Hospital about 5.30pm.