This is complete BS. You can't make absolute statements like this. CF can be stiff or noodly, just like any metal product can.psi_co said:The carbon post will flex a little side-to-side, a metal-post won´t.
That´s why I said " it depends on the post".alienator said:This is complete BS. You can't make absolute statements like this. CF can be stiff or noodly, just like any metal product can.
Unless you get a suspension post, your best bet would be to play with the air pressure in your tires to get a better ride...or change tire sizes so you can run lower pressure.
Exactly which manufacturers recommend replacing their CF posts every year? I'd say that's a load of crap, because it makes no sense to do so. The Alien failure was either a manufacturing flaw or a design flaw.mmercier said:I used to use CF posts, but now I use Al exclusively. I had the CF Alien Aero post on my race bike, but when I changed saddles it was a serious PITA to adjust the clamp. So, I got rid of the damn thing and went with an old-school, reliable Thomson Masterpiece. I can discern no difference in ride quality and the Thomson is infinitely more user friendly. Also, a friend of mine, last year's national master's RR champion, who rides about 13K a year, experienced a catastrophic failure of her CF post clamp. The clamp broke where it attaches to the post. As a result, her saddle simply fell to the pavement during a training ride. She weighs about 100 lbs. Luckily she wasn't hurt. It was an CF Alien post. She too now eschews all CF posts. She now uses a Thomson. Additionally, many CF post manufacturers recommend you replace their posts every year.
I used USE alien ti and cf posts on my Giant TCR. if there was a difference, it was a pretty small one. on my ti frame, I definitely can't tell any difference between ti and aluminum posts. on a really stiff frame, though, I imagine that Specialized post with the inserts would make a noticeable difference, all else equal.jhenry4 said:i recently replaced an old Al seatpost on a cannondale CAAD 2.8 with a specialized pave seatpost with the zert insert. this made a huge difference in comfort on a stiff frame. on a frame that has comfort features built in like the specialized tarmac this will make less of a difference, however if your body is more sensitive to vibration every little bit helps.