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is it common to snap a CF seatpost??(8 posts)

is it common to snap a CF seatpost??SeanKellys-reincarnate
Sep 18, 2003 3:07 PM
HI,

so on my ride yesterday.. (a sweet, "so far so good" 2 week old Litespeed Siena.. ) i hit a suddden dip in the road. it wasn't a jolt.. but it was enough to make me shift my weight to the back of the seat.. when all of a sudden CRAACK! my Selcof carbon fiber seatpost - not the top of the line one but a lower end version (which was an upgrade offered by my LBS over the stock seatpost) snapped where it met the frame..
that doesn't seem right..
so how common is this. was there anything i could have done to prevent it. (it was not raised above it's max line.. and i am only 163 pounds i had not made any adjustments since i brought it home from the bikeshop..)

gee i hope they replace it..
OH? - is a CF seatpost necessary on a TI compact frame bike?.. or should i go with something else? such as?

thanx for helping me
joe
It happens......RickC5
Sep 18, 2003 3:27 PM
If overtightened, or if the LBS "wrench" neglected to rotate the clamping ring so the bolt is at the front. Apparently having the split in the seat tube lined up with the split in the clamping ring results in a high possibility of overstressing a CF post right there at the split(s). I would immediately return the bike to your LBS. IMHO, they should replace the post, especially if they didn't rotate the clamp. Good luck!
friends MTB did. -nmjoe friday
Sep 18, 2003 4:32 PM
You should get a real seatpostMR_GRUMPY
Sep 18, 2003 6:48 PM
Either Campy Chorus, or Dura Ace, depending in what you have on your bike. Campy has had many failures of their Record carbon post, and I have heard of other brands cracking also.
You should get a real seatpostPMC
Sep 19, 2003 11:29 AM
Your correct on the Record posts being very fragile. I had one and even with the Campy clamp and the post tightened to specs, still cracked.

I'm now very happy with my Thomson setback post.
re: is it common to snap a CF seatpost??lyleseven
Sep 18, 2003 7:13 PM
I have never had one bust, but I had one seize in a steel seat tube and it was a motha to get out. Had to be destroyed to do it. No more carbon seat posts for me. I'm back to aluminum. Just about as light and every bit as tough. Can't notice the difference in the ride, either.
CF, IMHO is a 'gamble'..joe friday
Sep 18, 2003 10:42 PM
when the bars were first coming on the MTB scene about '95
a rep brought one in and explained how they cycled it 1/4 million times--OOhh---Ahhh, drilled holes in it, and cycled
again--Shazam!!
Needless to say, like all cool stuff, someone purchased one.. (Ya know how this story has to end right?) So he's
coming down from an admittadly hight jump and *SNAP*.
Well, the next time the rep was in we told him about it,
Ohhh---Uggg..
Alas that was many years ago, i'm sure there was prolly a
void in the composite and techniques continue to improve...
And they do make the tail section of some airplanes with the
stuff and those don't usually snap off--killing everyone inside....not usually...
Many seatposts out there.Ian
Sep 19, 2003 11:58 AM
I have seen quite a few break, from nasty crashes to JRA's, both in aluminum and carbon fiber.

And there can a large differnce in CF posts, from Easton who has a lifeftime warranty to USE who recommends replacement every year.

Get what you are comfortable with, and what you think looks good.

You LBS should replace the post, or give you a credit to another model if you don't want the same one again.

Ian