Road Cycling - Need help on my seat post sizing/need more flexibility

. My Bianchi is a smaller frame for me, and my seat post is maxed out with the rails of my saddle. I like the distance its at, but want more support under the saddle, I pulled the post out and it read 27.2N 00.11 - I dont have a clue, do any of you know what size this is, and what size I would need to get me alittle more room going back. thanks guys

It's a 27.2mm diameter post. If the post has no setback at the top get one that does.check www.coloradoradocyclist.com for pictures of posts, or other online sites.. Thought you got rid of that ill fitting bianchi?? Monkeying with saddle position in the etreme is not the way to get bike fit.You screw the pooch somewhere else.

the 27.2 is the diameter of your seatpost in millimeters. any 27.2mm seatpost should fit, it's just a matter of finding one long enough.

Yeah, thought about unloading it, but I actually dont have a problem with it. The saddle position right now is fitting fine, its just that the saddle seems to be stressed in the position of being all the way back. If I went with a new post it would be the same position it is right now, just more support? Does that make sense? Otherwise, I might keep my eyes open for a frameset.

If a larger frame had the same seatpost angle, you would still have the same "problem". Changing layback is a quite legitamate alternative to a custom frame angle, and much cheaper. I did it for exactly the same reason as you, but my saddle was at the extreme forward position of a std design post.

Find a seatpost with more layback. Be careful to get a post diameter with a good fit; Too big or small and you could damage the frame.

Nikos,
Moving the saddle back is not the best way to adjust saddle to bar distance. There is a correct position for the saddle, kneecap plumb over pedal axle with pedal at 3:00 when in your normal position on the saddle. Having the saddle back farther changes your pedal stroke, making it less efficient. To adjust the saddle to bar distance, you probably need a longer stem. This is where a threadless setup or a quill to threadless adapter and 2-bolt threadless stems come in handy. With the two bolt clamp you don't have to strip the bar to change stems. There are some two bolt quill stems, too.
Regards,
Raymond

Raymond, Im not wanting to put the saddle further back, but want more support under the saddle. With my current seat post the saddle is all the way back, maybe weakening the saddle performance? I was thinking of a post that would be placed more center under the saddle, but keep the distance I currently have - the stem is longer than the standard that I first started with.

MichaelW........there is a thing called KOP. It matters!!Friggin with the saddle position to the extreme to get fit ,is not the solution. some just don't get it though.

Both Nikos and myself have our saddles exactly where we like them to be. I set mine up with the help of a plumbline and a lot of tweaking about over several months. The result was that my saddle was clamped into the seatpost at the extreme forward position.

The saddle rails are more heavily stressed when clamped at the ends. The answer is to get a seatpost which will intersect with the saddle in the middle of the rails. In my case I use an in-line clamp. Nikos happens to need a post with more layback.

Where you clamp the saddle rails is a separate question to where the saddle should be. Some people spend thousands on a custom frame with a particularly steep or relaxed seatpost angle, so they can use a standard layback seatpost to position their saddle correctly. In the olden days, seatposts came in one shape only, but today there is a wide range of laybacks available.

Im not sure how useful KOPS is. I used it simply as a starting point. In practice I put my saddle where my butt wants to sit.

Thomson makes a setback seatpost in 27.2, 250mm and 330mm in length. Plenty of suport and probably the strongest made.

Ok, so I know that my post is 27.2 - how do I determine the length that I need? I dont think there was an indicator on the post.

Well I would say at a minimum you need at least 4" or 100mm down in the seat tube. So add that to your desired height above the seat collar.

Originally posted by pokey
there is a thing called KOP. It matters!!

not according to keith bontrager (http://bontrager.com/keith/rants.asp?id=12)