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Is this true ? Seat clamp rotation(7 posts)

Is this true ? Seat clamp rotationixiz
Aug 6, 2001 9:27 AM
I called USE (alien carbon post) mfg and talked to their cust svc.
The highly recommend when clamping the carbon post that you rotate the clamp, so that the open section (bolt location) is opposite the slit on the seattube. Does this actually / theoretically distribute the force evenly?

And on top of that the post has only 1 year of warranty !!! (worried)

Anyone has other issues with the carbon post ?
?? have oneDog
Aug 6, 2001 9:37 AM
I have the Alien carbon on my Bianchi. It's very light.

It's somewhat difficult to set up, plus I've had it come loose on a ride. It has two very thin, but long screws that pull the seat rail clamping mechanism tight. Fore/aft and angle adjustments are made by loosening the screws. The screws seem too small and fragile to handle the level of torque it seems necessary to hold the clamp securely.

When tightening the screws, alternate between the two, tightening a little each time, or else one will be tight and one will get loose. If it loosens on a ride, chances are you won't have the tiny hex wrench with you to retighten, as, at least with my emergency tools, one that small is not included.

I found it very difficult to get the clamp on the rails initially. This is not a post to use if you switch saddle often. Just put that SLR on there and leave it.

Didn't read anything about the seatpost clamp. I'd think the mechanics of what happens there would depend as much upon the frame collar there as anything.

If you want light, this is it.

Doug
broken posttcr01
Aug 6, 2001 9:46 AM
A local racer just broke his 2 week old USE carbon. 170 lbs and the thing snapped like a twig resulting in a trip to the ER. Is the weight savings worth it?
Whats the outcome of the investigationixiz
Aug 6, 2001 11:11 AM
Did USE say its not their fault ?
When it snapped was it imediate or was there some indications before ?
re: Is this true ? Seat clamp rotationgwilliams
Aug 6, 2001 10:45 AM
I was told the same thing by them, but I have been using one now for over 1000 miles without rotating the clamp with no problem. The heads on the bolts are fragile and I do not think they would hold upto to many removals and reassmbling. I contacted them and requested a couple extra of the bolts, which they said they would send, but so far I have not recieved them.

Gary
Other sources also recommend Seat clamp rotation.Steeeve
Aug 6, 2001 11:19 AM
I have read from other sources (not Use) to NOT align the seatpost clamp slit with the frame slit on other types of seatposts/clamps/frames. (I do not remember it being 180 degrees though).
That's what Excel Sports told me12x23
Aug 6, 2001 5:36 PM
I purchased a USE carbon post and found it was iffy getting proper setback. I called Excel to ask about returning the post and this is when the rep told me USE wouldn't warranty it if the clamp wasn't rotated. I returned the post.