tilt adjustable seat post
 

My post diameter is 26.8 does anyone know where I can get a seat post with the micro-adjustment feature that lets you adjust the tilt of the saddle? How about a shim so i can use a 27.2 size seat post?

Shims will allow you to use a seat post of less tan 26.8 dia.

http://www.niagaracycle.com/advanced...427e5daf0b08fa

The above link has shims and seat posts. Some are micro adjust. And as the other reply noted, you shim froma smaller seat post to a larger seat tube.

Every seatpost, or saddle clamp, allows you to adjust the tilt of the saddle. You loosen the bolt, or nut, adjust tilt to desired angle, then retighten nut or bolt. However, some post, and most saddle clamps, have coarser serrations then others.

Google is your friend;) This search gave 3 very good candidates...at a minimum.