UCI rule dictate that you cannot mount a computer where you can see the screen when you are track racing.
With this you can mount you garmin 500 to the back of your seatpost underneath your saddle.
Suits a 27.2 seatpost diameter
Leave comments if you need a different diameter or aero section and i can make a new version to work.
Required 1 cable tie to secure it in place.
power meter mount,
3.35 w x
3.02 d x
1.319 w x
1.189 d x