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Carbon Steerer tubes and stems(3 posts)

Carbon Steerer tubes and stemsneo
Mar 14, 2002 11:58 AM
I read once that manufactures recommend at least 1/4 inch of space above a stem, using a spacer, so the stem is not "clamping" onto the end of the steerer tube to prevent cracking and deformation. Has anyone else read this or practice this?? Any problems if you clamp the stem to the top of the tube?? I have an Easton EC 90 fork with a Chris King threadless headset and Ritchey stem. 1 inch in diameter and I weigh 185-190. Or shouldnt I worry about it...........
Neo
Gap for the steerer tube...Pedal Jockey
Mar 14, 2002 12:53 PM
The steerer tube on my Reynolds Ouzo Pro fork require a 3mm recess below the top of the stem or spacer. I have a riding buddy who has the EC-90 fork which was installed by our LBS. They did not cut the steerer tube short enough, and as a result, we could not properly adjust the headset (his is also a King). We moved a spacer above the stem (hence lowered the stem), and we were able to adjust it properly, but it still is not quite right. Patrick Piller at Veltec told me there needs to be 3-4mm of space between the top of the steerer tube and the top of the stem or spacer for the EC-90.

PJ
Ritchey stem should be fineTig
Mar 14, 2002 3:12 PM
If you have the WCS stem with the opposing bolts (screws in from each side) you should be in good shape. I believe Ritchey bevels the inner edge surface where the gap is to prevent stress on the carbon steerer. I don't know if they do this for all models or not.

The other stem that is well designed for carbon steerers is the Thomson Elite. It has a pair of round opposing plugs that squeeze together to clamp the stem. It weighs a little more (200 grams total), but is a very safe and solid stem. I haven't had any problems with mine at all.