The 19-year-old was cycling on Drymen Road approaching the A811 when a dark car cut out in front of him and hit his front wheel.
The man was knocked to the ground and the car made off without stopping.
The cyclist, from Alexandria, sustained heavy bruisng to his thigh and his bike’s front tyre and gear change lever were damaged.
The incident happened at about 11.30am on Sunday, August 2.
Police ask anyone with information about the incident to call 101 or Crimestoppers on 0800 555 111.
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