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Carbon frame question(11 posts)

Carbon frame questionjaybird
Apr 9, 2002 9:55 AM
I just wrote the check for a new Look 381i (Kelme). This will be my first carbon frame and i will be building it up myself (Campy chorus 10 and Ksyriums).

How do i put it in a workstand. Can I clamp a carbon frame just like steel or ti? With AL bikes I have used the seatpost but with the Look the seatpost is carbon as well and it is only 25.0 so I cannot just put a crappy one in to work on the bike...

Break down and buy the crappy onerobbz27
Apr 9, 2002 10:13 AM
Seriously. Buy a cheapo seat post. If you know enough to build it on your own and you are investing that kind of money into this project, do yourself a favor and find a cheap aluminum or steel post. What are you going to do when you need to perform a tuneup? Or check the gears, tighten the BB? I think it's worth it in the long run.

Your other option is a seat post adapter from Park, but they are going to run you more than a regular seatpost and I've had them slip out on me personally.

Good luck and enjoy!!

Remember, righty tighty, lefty loosey (except BB and pedals!!!) JK
Break down and buy the crappy onejaybird
Apr 9, 2002 10:31 AM
I would if I knew where to get a cheap 25.0mm seatpost... I didnt see any in QBP and I havent seen any anywhere other than the Look catalogue hence my dilema... I might have to buy the park adapter...
Just an idea...Nessism
Apr 9, 2002 11:15 AM about picking up a piece of 1" wooden dowel rod. 1" = 25.4mm so it should be close. A little sandpaper should make quick work of the extra .4mm. Local hardware should have some.

re: Carbon frame questionJimP
Apr 9, 2002 10:19 AM
One of the strongest places to clamp is just below the top tube on the seat tube - the seatpost is there for reinforcement. Don't clamp too hard and make sure it is padded enough.
A word of caution about the seatpost - only tighten the binderbolt enough to keep the seatpost from moving. Look uses an internal binderbolt which will crush or at least put serious dents in the carbon seatpost if overtightened.
re: Carbon frame questionpmf1
Apr 9, 2002 10:28 AM
I've got a carbon (Look) 27.2 seatpost on my Kestrel and a carbon Colnago 28.0 seatpost on my C-40. I clamp either into my Park workstand. You should be able to clamp your post into the stand as well. 25 vs. 27.2 is not a big difference. If nothing else you should be safer than a 27.2 because the clamp won't be gripping as hard.

I would never clamp a frame into a workstand. I think carbon seatposts are strong enough to stand a work stand clamp. I've done it for years. If not, you buy a new seatpost. If you make the same mistake with the frame, that's a costlier one.

In short, don't worry about it.

Nice bike. You'll enjoy it.
I guess I'm a heretic.McAndrus
Apr 9, 2002 11:06 AM
I have a Giant CFR (carbon frame). I clamp it on the top tube - a few inches in front of the seat tube. At first I was worried about it and tried using the seatpost. The bike was just too low to work on that way.

My stand has rubber thingies in the jaws and I clamp it just-snug. It holds it firmly enough to work on and leaves no marks.
I guess I'm a heretic.flybyvine
Apr 10, 2002 2:28 AM
Make that two heretics..

I also clamp a C-40, Merlin and Lemond Alu on their top tubes. Its really just there to stop the thing falling over & bring it up a bit higher. If I want to torque a BB or the like I put the bike on the ground anyway.

re: Carbon frame questionwhtogls
Apr 9, 2002 2:40 PM
American Classic has 25.0mm seat post. You can get one from or bike nashbar. I'm currently using one on my KG281.
One of the best SP made......... nmJohnG
Apr 9, 2002 9:38 PM
American Classic seat postNessism
Apr 10, 2002 7:04 AM
The new two piece AC seat posts are quite a bit different from the older version.

Old version:
One piece construction, uses 6061 aluminum, nicer looking head design (my opinion), very nicely polished and anodized, made in USA

New version:
Two piece construction (head is bonded-glued on), uses 2014 aluminum for post (stronger than 6061), longer length, finish quality is quite poor compared to old version, made overseas in Asia somewhere.

One thing that bothers me is that AC still makes the one-piece old design but they raised the price from mid $30's to mid $50's. Same post as before. Either they were giving us a great deal before or they are ripping us now.