Problems with a slipping seatpost I got a Cannondale Quick1 2010, with the seatpost made with aluminium carbon-wrapped.

The problem is that the seatpost tends to slide downwards, even if I squeeze a lot the snap ring; if the ground is uneven the seatpost slips completely.

Is there a way to solve this problem?

Many thanks.
Your local bike shop should be able to sell you some carbon gripping compound, for example Finish Line Fiber Grip.  Other similar brands are available!

I've no idea what the seatpost clamp is on your bike but I'm always suspicious of ones that are hand tightened.  I have 2 bikes with carbon seatposts &amp; Ali frames, I use Salsa clamps that require an allen key &amp; I don't experience any slippage.