New seatpost. An aluminum polished dropper post. Going into an aluminum bike.

Both 30.9, double checked with calipers.

First install, used light grease on the post as normal. It slid down a bit while riding. I tightened it as hard as I was comfortable with cranking, Most likely way over torque. It still lost a little elevation throughout the rest of the ride.

I revisited the installation and cleaned up the post and reinstalled with fiber grip. Again, I coupled that with serious ham fisting.

Same result, it’s slightly sliding down.

This hasn’t drastically affected my rides because all good stuff is done with the dropper down. Still irritates me that it’s slipping.

So I’m thinking about whatever my third attempt will be. It’s always a hassle due to the internal routes dropper cable.

I don’t have room on the frame for a standard 2 bolt seat collar.

I have noticed that the surface of this new seatpost is just a lot more polished than my old one. I think that’s the problem. I’m considering scratching it up with course grit sandpaper. I don’t love the idea that this would remove material. If it didn’t work it could make the problem
worse.

I did discover a double clamp that would fit, one side goes directly onto the post, and the other over the frame. Seems viable, but a little bit bulky. Obviously installed with plenty of fiber grip.

Anything else I should try while I wait for the new clamp to arrive?