Slipping Seat Post / Seatpost slip

has anyone got a brothercycles frame and had a problem with the seatpost slipping down when its fully done up?

my seatpost is ruined now because it slipped and then i pulled it up and it scratched to buggerey!!! bugger

shim

wrong sub-forum

and,

http://www.easycaribbeanshop.com/media/catalog/product/cache/1/small_image/135x135/5e06319eda06f020e43594a9c230972d/D/G/DG_Grapefruit_Ting_Can_330ml.jpg

Get a seatpost that fits.

Nah its the frame that causing the problem.
Seatpost is fine, definitely get a new frame though.

Carbon frame = shimmed
Steel frame = need to be reamed
Alu frame = just right

raped! well the guy at tokyofixedgear put it on!

all solved mine was the wrong seat pin

Coke can shims will stop slippage, but if you run the wrong size seatpost for long enough you may crack your frame as the seatpost isn't supported all the way down... they tend to go round the front of the seat tube. I wouldn't do this on a decent frame, esp anything with thin walled tubing.

My lemond had the right size seatpost and it still slipped. tried tightening the seat clamp, up to the point where it snapped. BC guy put some paste on the seatpost that contains plastic granules. That stopped it.

Has anyone used a shim on a 27.2 post in a steel frame to success?

Mine seems to be slipping a 1cm every mile, then slips completely!