In this ible i'm going to show you how to make a Bike Seatpost Mount spending less than 5$.
Few months ago I made the Bike Handlebar/Fork Mount. It's a really good mount because it allows you to mount your action camera on the handlebar or on the bike's frame (both on rear and front fork).
But, since the seatpost it's inclined backwards (photo#4), you can't use that mount otherwise you will film just the sky.
So I made this mount, with the improvement of a tripod mount adapter, that allows you to incline the camera keeping it parallel to the floor (photo#4) and to film your rides from a different point of view.