Four women allegedly sexually assaulted by bike rider in Victoria

Police are searching for a male after four separate women were sexually assaulted on Victoria's Mornington Peninsula.

Detectives believe an unknown male was riding his bike when he approached the women at separate locations and struck them on the backside in January and February this year.

The offender fled the scene on his bike following each incident.

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Police said the first incident occurred on The Boulevard in Somers on January 22 about 10.30am.

The second incident occurred on Tasman Road in Somers on January 31 about 6.10pm.

The third incident occurred on Peterson Street in Crib Point on February 1 about 5pm.

Police believe the final incident occurred on Sandy Point Road in Balnarring on February 13 about 5pm.

Investigators have released images of a bicycle and a backpack associated with a male that may be able to assist them with their enquiries.

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He is perceived to be Caucasian in appearance, about 14-19 years old with blue eyes and blonde or brown hair.

The male was last seen wearing a light-coloured t-shirt, black pants, a navy-blue Nike backpack with a vertical white stripe on it and riding a white and blue bicycle.

Anyone who recognises the male, has dashcam or any information is urged to contact Crime Stoppers on 1800 333 000.