Cyclists have been terrorised on Beach Road by motorists screaming abuse and hurling bottles of soft drink at them.

Two men in a green Holden Commodore began following and harassing a group of cyclists along the popular riding route at Beaumaris about 7.10am on Wednesday.

Rider Melinda Fisher said she was lucky to be alive after she was hit in the head by a full 1.25 litre of Coke that was hurled from the car.

The amateur triathlete was riding at 35 km/h when she was struck by the full soft drink bottle.