A postie became the unsuspecting victim of a police pursuit after the offender allegedly kicked him off his motorbike and used it as a getaway vehicle.

Police pursued a stolen car, after receiving reports a vehicle was being driven erratically in the Frankston area, about noon on Friday, a police spokeswoman said.

A postie suffered some minor injuries after an offender involved in a police pursuit allegedly knocked him off his motorbike.

The offender then dumped the car on Beach Street, got out and started running, before he found a postman on his motorbike, who was doing his afternoon mail deliveries.

"After running a short distance, the offender then pushed a postman off his motorbike, stealing the motorcycle and fleeing," the spokeswoman said.