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Carbon steerer/stem compatibility question(8 posts)

Carbon steerer/stem compatibility questionheckman
Jul 27, 2003 12:43 PM
In my ride this morning, one of the other riders told me that I should not have the fork/stem combination on my bike that I have. He said that certain types of stems are bad for forks with carbon steerers. I have done a number of searches, but while a number of posts reference this issue, I am not finding any solid information that I can go from. Can someone please help me?

I have a 61 cm Litespeed Tuscany, with a Look HSC3 fork and a Thomson Elite stem (see picture for setup). My LBS set this up for me and did not say anything about there being a potential issue. Thank you for your help with this.

Larry
I could see why!the bull
Jul 27, 2003 6:11 PM
I cant really prove it though.
I would think that it is not as secure as a "normal" stem(when used on carbon) that would put an equal amount of force around the tube.A stem like this would put more force in the front of the tube to hold it in place.Kind of like a wedge instead of a clamp.This would put alot of pressure in one are to secure it.
re: Carbon steerer/stem compatibility questionRusty Coggs
Jul 27, 2003 7:05 PM
If it uses a wedge,it concentrates the pressure at one point.Ok for steel or aloy,but not CF. I have a Carrera frame that uses a seatpost wedge or pinchbolt as often refered to,and no way with a CF seatpost.
I think you're ok on this onecxer
Jul 27, 2003 11:35 PM
The Thompson is designed to distribute stress evenly around the steerer. This is not a case of a wedge or pinch bolt.
Deda has a full carbon stem that clamps in a very similar manner. I think it's called the Unika
Thanks for clearing this up for me (nm)heckman
Jul 28, 2003 5:18 AM
re: Carbon steerer/stem compatibility questionDustBowl
Jul 28, 2003 6:49 AM
This topic was covered once before with I believe a Reynolds/Thomson combination. After e-mailing Thomson I believe the reply was that the stem is designed to work with carbon steerers. e-mail them yourself for confirmation.
re: Carbon steerer/stem compatibility questionsparklenuts
Jul 28, 2003 8:22 AM
Lots of people in the MTB world use Thmson stems with Rock Shox SID black box (carbon steerer) with no problem.
Checked the Thomson web siteheckman
Jul 28, 2003 10:17 AM
and in the stems FAQ section is the answer.

"Q - Are Thomson stems approved for use with carbon steerers?
A - Reynolds, Look, Time, Wound Up, Rock Shox, and True Temper have all approved Thomson stems for use with carbon steerers."

http://www.lhthomson.com/stemfaq.asp

Thanks to everyone for your responses.

Larry