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Quick question about carbon steerers...(8 posts)

Quick question about carbon steerers...jeebus
Feb 4, 2002 7:21 PM

What's the max height of headset spacers on carbon steerer tubes? I've got a new 1" LOOK HSC3; the installation instructions give no guidelines for this.

Right now, I have it set for 1.5 cm, but I'd like to leave a spacer (maybe just 0.5 to 1.0 cm) above the stem to increase my range of adjustment.

re: can't speak for the LOOK but,Akirasho
Feb 4, 2002 7:45 PM
Reynolds recommends a total stack height of 1" on 1" steerers and 1.5" on 1 1/8" steerers (using a minimum of two spacers)...

We abide.

Remain In Light.
re: Quick question about carbon steerers...CT1
Feb 4, 2002 7:58 PM
Don't know the factory # but it's probably 2cm.

I'll say that my 1" LOOK carbon steerer felt pretty flimsy with 1.5cm of spacers. I've got the spacers down at 0.75cm now and it feels OK.

I have the hsc3 also on my 386Paul
Feb 5, 2002 3:51 AM
Good question, I used 1" of spacers when I really wanted 1.5 ". "Experts" tell me that you shouldn't use more then 1" for 1 inch steerers, and 11/8 spacers for 1/18 steerers. Look doesn't mentioned this in their instructions. Maybe call them at 1-800-991-0070, saw this number in Triathlete Mag. The LBS talks about "whip", and stress on the steerer. Anyway, I cut mine for 1". Let me know what you find out.

My experienceAFred
Feb 5, 2002 6:12 AM
I have just under 1.5 inches of spacers between my Look HSC3 steerer and a Mutant stem. It was set up by my LBS (a top-notch shop serving roadies and tri-atheletes) two years ago after an extensive fitting session. The original idea was to reduce the stack height gradually after a few months, but I've grown too comforatble with this set-up. I have not experienced any problems. I check for tightness/play before each ride.
My experienceJcamelback
Feb 5, 2002 7:41 AM
I originally used a Look HSC-2 1" fork with my old bike and i noticed lots of flex in the fork, excessive to be exact. I'm 160 lbs and I do most of my training riding climbing out of the saddle where I'm putting a lot of pressure on the bars/stem/fork combo.

6 months ago I purchased a new bike and put a Look 1 1/8th HSC-3 carbon fork with carbon steerer tube on it. This thing rocks, absolutely no unwanted flex at all and the fork dampens out a lot of road noise. Many people feel the 1" older Look models simply were not robust enough, but the new 1 1/8th models seem to have cured this problem.
look forks....g-money
Feb 5, 2002 7:30 AM
I run an HSC3 1-1/8 with 2cm of spacers. I'm also a fairly big guy. I feel NO flex at all at the stem. My bars however flex alot. My quess is you'll be fine running the amount of spacers you stated. The Look site only talks about the superior one piece construction of their forks. I'm sold, I can tell you. It's interesting if you go to the Profile site there is page after page of disclaimer info regarding the corbon forks with carbon steerers. I would suspect that Look would put any "required" spacer #'s in the instructions, if they felt it was an issue. Just simply due to the liability situation.
I've notice pro Look frames using thin spacersPaul
Feb 5, 2002 8:56 AM
with stems that have a rise. Feel this might be due to weight reducation, less flex, and with the rise, getting the drop they like.
I have a 3.5 inch drop that currently I have just a little problem with, but I like the aero position. I would buy a stem with a small rise to compensate for the short steerer. I've noticed no flex at all with my hsc3.

In general, 11/8 has to make for a stronger steerer. The new Look 381i has an 11/8 integrated steerer.