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carbon seatposts and clamps???(17 posts)

carbon seatposts and clamps???hycobob
Jan 30, 2004 1:38 PM
Do the seatpost clamps really need to be backwards when using a carbon seatpost? I just got an Easton carbon post and don't wanna screw it up... Thanks
re: carbon seatposts and clamps???Dave Hickey
Jan 30, 2004 1:47 PM
I turn it around. I had a brand new $100 Record carbon post and cracked it when the seat tube slit was aligned with the back of the clamp(I probably over tightened it). With the replacement, it turned around the clamp and never had a problem.

If you torque it to spec, you'll probably be fine either way but it certainly doesn't harm it to turn it around.

Just my 2cents.......
Campy makes a beautiful clamp....Gregory Taylor
Jan 30, 2004 2:37 PM
It's an offset design specifically for carbon seatposts. I run one -- it's a beauty!
Campy makes a beautiful clamp....agreedboneman
Jan 30, 2004 3:03 PM
I have one on my C40, replacing the Colnago clamp. It's well designed and functional. Also have one on an Al bike as well.
Back view of offsetboneman
Jan 30, 2004 3:04 PM
How about a shot of the whole bike?DERICK
Jan 30, 2004 5:33 PM
Campy ClampBixe
Jan 30, 2004 2:57 PM
There's a very good reason that Campy supplies this clamp with their Record carbon posts. It makes sense to apply this logic to any carbon post....
Campy Clamprogue_CT1
Jan 30, 2004 3:28 PM
I couldn't agree with you more Bixe- The Campy clamp is the best seat clamp for carbon posts. Period. I use one on my Colnago CT-1, on my TT bike and when my C-50 gets here I'll put the Campy clamp on it and toss the Colnago clamp.

To answer the original post- Bixe's pictures show the proper way to mount a Campy clamp. They are $20, spend the money and you'll never have to worry about your $100+ post.

Here's where I get mine:

Order part #ST-91-07 31.6 to 31.9 mm Offset Campy removable seat post clamp for use with carbon posts. 22 gr. Tighten to 7.4 foot/pounds or 10 Newton/meters $19.88
Campy ClampJFST
Feb 1, 2004 1:17 PM
Yes you're right. There is a reason they make such a good clamp for the record seatpost. The Record post is a piece of junk. While it is a good idea to use many of these clamping techniques on carbon posts it is not necessary on any good one. The record post is one of the weakest most brittle carbon parts I have ever seen. I cracked mine without even tightening it. It would slip when riding, tightened it justa but more and CRACK! I should have listened to the reviews here which said the same thing. Would have saved 120 dollars. I took the now useless post and bashed it with a hammer just for curiosity and it started falling apart right away. Out of curiosity I tried the same witha piece of carbon post from easton and Look which I had sawed off to make the posts shorter and couldn't even manage to make a mark on the post after striking it repeatedly. Its quite obvious who makes the better carbon parts.
Campy Clamprogue_CT1
Feb 1, 2004 5:03 PM
I've used mine for almost 2 years and 6,000+ miles with no problems and I weighed anywhere from 237 lbs to 206 lbs. My riding partner has had his even longer without a problem.
Yeah but....divve
Feb 1, 2004 8:50 PM
Have you tried hitting it with a hammer yet? :)
Oh no I forgot to try that test (nm)rogue_CT1
Feb 3, 2004 8:19 AM
My Look 461 have its own internal clamping mech....6was9
Jan 30, 2004 7:43 PM
and I cannot use the record clamp. The internal clamp seems to be holding my record carbon post fine so far but on the back of my mind I am a bit concerned. Any 461 owners have any problem with cf post?
None for 10 monthspitt83
Jan 31, 2004 5:31 AM
Except that the EC70 I bought when I first built the bike broke at the head. The Deda blackstick is NP. I'll open and close the clamping mechanism to put the bike in the workstand (raise the post) and still not a problem. Could be a function of the post and not the clamp though. I'll bet you're fine. Looking at the mechanism, it seems to distribute the clamping force over a much larger area than a traditional collar clamp.
My Look 461 have its own internal clamping mech....JFST
Feb 1, 2004 1:20 PM
You might want to check it at some point. That post is NOT recomended on the look pinch bolt system. If you take it out you might very well find that the pinch barrel is carving its way into the post.
standard clamps, no problems...C-40
Jan 31, 2004 7:01 AM
I have carbon posts on a C-40 and a Fondriest Al frame. Use the standard clamps in the normal position with no problems.
re: carbon seatposts and clamps???hinaults dog
Feb 1, 2004 3:21 PM
noticed that astarloa's bike has a backward
facing campagnolo clamp (cyclesport feb)
ambrosio also make this type of clamp 1/2
the price of the C