|Seatposts.... Any suggestions?||kushogun|
Oct 15, 2001 10:31 AM
|Hi all. I'm looking to drop some weight on my bike. I am looking for a new seatpost to try and accomadate this task. Currently I have a very heavy Kalloy 27.2 mm post with a rediculous 7mm stainless steel bolt. I have looked at Dura-Ace, Thomson, ITM Millenium, U.S.E. Alien carbon and aluminum, and Campy posts. I know there are pros and cons to each of these post but surely there must be some concensus. Do the cabon fiber posts (Campy Record & U.S.E. Alien) improve any vibration dampening of any significance? If not Ti help out? I am a light rider on a stiff CAAD 4 C'dale. Looking to improve some ride quality and shave some weight at the same time. Thanks everyone!|
|Yeah -- my suggestion? Don't sweat it. You can save a few||bill|
Oct 15, 2001 10:55 AM
|grams on some of the cooler seatposts, but not that many grams (the U.S.E. post I guess is the lightest, and you can save some 50 grams over other ti and carbon; maybe 80 gms less than the fartiest, cheapest alu), but I still would make sure to buy function over weight. None save much weight, and none make ANY difference in ride quality that I can determine, having tried alu, ti, and carbon. |
In my view, the key considerations are whether you get the setback that works with your position on the bike, whether the angle adjustment fits your needs (I have a slick carbon post that I can't get exactly level; what're you going to do? I had to return a slick ti post because it simply could not be adjusted to a sufficiently acute angle to work with my saddle rails), and whether you need something sturdy for the stand clamp, because I for one am not comfortable clamping onto carbon (maybe that's silly -- how much worse could it be than clamping the stem onto the carbon steerer?). Then, weight and aesthetics.
|re: Seatposts.... Any suggestions?||Mike P.|
Oct 15, 2001 2:52 PM
|I bought one of the USE Alien carbon fiber seatposts along with a Sella Italia SLR saddle; paid $125 for the two items. I sold the SLR saddle for $90 and my old seatpost for $30. So in the end I only paid $5 for the seatpost.
As for the Alien CF seatpost. . . the seat mounting hardware looks very fragile to me. I did take much care while installing my old saddle. I have ridden 600 miles or so on it and can say I honestly can't tell a difference while I'm riding. It is worth the $5 I paid for it though in weight savings, I guess.
|1 vote for Thomson||Eric|
Oct 15, 2001 6:11 PM
|From a pure engineering standpoint, the Thomson design is very difficult to beat. It is very strong (no bonds), very light (sub-200g in road lengths), and infinitely adjustable with great ease. Plus the machining on the shaft seems to keep this post in place on frames where slippage (down) might be an issue. The only downer is that the straight version does not allow a rearward saddle position for most, and the setback version has the bend in the shaft. If you require the setback (the SB Thomson has 15mm) and can get past the curved look, I would recommend the Thomson.
As for carbon and Ti, consenus is that they do not really affect shock absorption. Tire pressure and saddle padding will have a much greater effect. Plus, the carbon posts can be a little on the fragile side.
Oct 15, 2001 6:19 PM
|I swapped my AmClassic post for a Thomson about two or three months ago and couldn't be happier with it. I've never heard a persuasive case of significant shock absorption with a carbon post.|
|as for the weight||cyclopathic|
Oct 15, 2001 6:21 PM
|Kalloy posts Cdale uses ~300g.
Yes you would save 1/3lb if you switch to USE.
would it make you faster? not really
it will only best your pwr/weight ratio by ~0.2%(!)
with respect to ride quality yes they imrove vibration dampening..
how significant? depends on how much post is exposed longer better
|Carbon post DO dampen shock||B1|
Oct 15, 2001 8:20 PM
|I have a Cannondale CADD6 with a Hurricane carbon post. I switched from a Thompson that came with the bike to the Hurricane. I noticed a more damped ride. I did'nt think that I would till I tried it. I dont think I'll ever go back to an aluminum seatpost again, at least not on a full aluminum bike.
On the other post's the respose's have been that carbon does'nt dampen, why do you think all the rage in road bikes is carbon seat stays? they are not there to lighten the bike, but to improve the ride quality on an aluminum frame
|Carbon post DO dampen shock||Birddog|
Oct 15, 2001 8:48 PM
|I respectfully disagree. I have an Easton carbon fiber seatpost and I cannot tell any difference. I do like the seat clamp though, it is very easy to adjust. A seatpost is ....well it is a post. It has very little to do with any ride/performance qualitiies since it's function is to hold the seat and be adjustable primarily in length.
Seat stays and chain stays, however, are part of the frame, and by virtue of their position in the rear triangle, have a great deal to do with ride/performance characteristics. They are positioned precisely so that they can flex in concert with the other tubes and deliver the performance the designer intended.
It is possible that you can detect a difference, but as for me I can't.
|CF is overrated..read this||tcr01|
Oct 16, 2001 5:22 AM
|Read the below link on CF. I agree and think all the CF stuff is pure hype. An easy way for the industry to make a lot of money on coolness factor of aesthetics. As for CF posts. I witnessed a 2 week old Alien post crack like a twig under a 160 pound rider on a section of flats. Needless to say, he ended up in the emergency room. I switched from a Giant carbon post to a Thomson this year and I think the ride is better with the Thomson. As for people being able to tell the difference between CF and aluminum, in post or seat stays, I think its totally psycological. Its amazing how people seem to be able to justify the quality of something b/c they think it looks cool. That's exactly what the bike industry wants people to do. |
|Thanks for the excellent article. -NM||Tig|
Oct 16, 2001 8:54 AM