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Old 07-06-15, 01:29 PM
  #4  
dr_lha
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Join Date: Oct 2014
Location: Central PA
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Bikes: 2016 Black Mountain Cycles Monster Cross v5, 2015 Ritchey Road Logic, 1998 Specialized Rockhopper, 2017 Raleigh Grand Prix

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I assume the seatpost clamp is a quick release one? It needs to be tighter clearly. Usually there is a screw adjuster as well as the lever arm, try tightening that.

If that doesn't work, seatpost clamps are cheap and easy to get. As @Judi says, a trip to your bike shop will sort you right out.
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