So I just today finally bought the last missing piece to my frame, the headset.

After putting it on and tightening everything down I took it for a ride.

After I was done I realized that the seat post had moved and gone down, although I had tightened it as hard as I possibly could before breaking anything.

Any ideas what could be happening? I'm using one of the cheaper Leader seatposts.

My thought is that the inside of the seat tube, and the seat post itself, are way to smooth and aren't causing any friction to keep it stable.

Should I grab some light sandpaper and sand the bottom part of the post?

Nvm, ended up grabbing a thing sharp blade and nicking it all around the bottom end.

Now it has some raspyness to it and it grabs onto the frame better.

Is the frame brand new?

If that's the case, did you condition the seatpost clamp first? When I bought my tr727 straight from leader via coghouse it came with paper instructions on how to condition the seatpost clamp. You have to tighten and loosen the seatpost clamp 5 - 6 times before mounting a seatpost properly without slipping. Very important considering the seatpost clamp is integrated and too much torque can strip it/ your frame. If you already did that; try doing it a couple more times, but a tad bit tighter.

This lacked judgement.

"yeah my car's paint job was too shiny so I took a brillo pad to it"

[QUOTE=Leukybear;12766298]Is the frame brand new?

If that's the case, did you condition the seatpost clamp first? When I bought my tr727 straight from leader via coghouse it came with paper instructions on how to condition the seatpost clamp. You have to tighten and loosen the seatpost clamp 5 - 6 times before mounting a seatpost properly without slipping. Very important considering the seatpost clamp is integrated and too much torque can strip it/ your frame. If you already did that; try doing it a couple more times, but a tad bit tighter.

[QUOTE=Leukybear;12766298]

Woah D: I didn't get any paper

Why did you start two separate threads about supposed "problems" you're having with your frame?

/thread.