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Spacers on top of stems on carbon steerers.(5 posts)

Spacers on top of stems on carbon steerers.J.S.
May 31, 2001 3:53 PM
In the new issue of procycling their is a story about a rep. for Deda( stem and bar manufacturer) In the story the rep. laments the look of the Fasso Bortolo team bikes( Pinarello's) because they run spacers on top of the stem. The team mechanic explains that with the stem positioned at the top of the steerer(no spacers) the stem can crush the top of the steerer when tightened. Interesting.
re: Spacers on top of stems on carbon steerers.mark203
Jun 1, 2001 9:58 AM
It is also a nice set up so that you can adjust your stem height in the beginning (before you make that all important cut) of stem height adjustment. I never thought of the possibility of cracking or otherwise damaging the top of the steerer...now two reasons to do it (it does look crappy though)
careful with that axe, eugeneminor threat
Jun 1, 2001 12:20 PM
i have my doubts. have you ever banged on cf tubing with a hammer? i have. way back when the spec epics came out they sent around little rings of tubing for the shops to play with. we banged ours around on the concrete floor all the time. it was TOUGH, and never did break, even tho it was as light as a feather and only one inch long. a similar piece of alu would surely break in two, and steel would undoubtably bend and buckle in an instant under the same abuse.
Ya, that's the same as clamping a stem.....?J.S.
Jun 1, 2001 2:05 PM
Banging a piece of CF tubing on the ground, very scientific. These mechanics were having problems with steerers crushing when clamping stems, that's why they did this. Now if the racers rode around then removed thier stems, turned thier bikes upside down and smacked the steerer tubes on the ground during a race you might have something, Eugene.
Ya, that's the same as clamping a stem.....?minor threat
Jun 1, 2001 2:23 PM
first, what crushed steerer? they never said it WAS a problem, only a worry. second, my point was that cf tubing is stronger, and more resistant to breaking than one would initially think. these mechanics were acting on what they thought might happen, not what had happened, and good for them for doing so. if anything i would estimate the intense force generated by a hammer blow to be MORE likely to cause a failure than the perfectly smooth fit of a stem spread across the entire structure,exerting force exactly where the piece was designed to take it, wouldn't you? finally dontcha think they test these things? think wound up, look, reynolds want to be sued? they have made no such recommendations for use of their products.