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Spacers on Look HSC3 Fork(9 posts)

Spacers on Look HSC3 ForkBroomwagon
Jul 25, 2002 8:38 AM
I'm helping a friend spec his new bike and have a question regarding spacer height on carbon forks.

What is the maximum height of spacers can one use on a carbon fork? The fork that I'm using is the Look HSC3. I've been told that the recommended height ranges from 25mm-30mm. Is there a danger with going beyond 30mm?

I plan to use carbon spacers. Will it make any difference if the spacers were alloy vs carbon in relation to the overall height?

re: Spacers on Look HSC3 Forkjaybird
Jul 25, 2002 8:56 AM
I just finished building up a Look bike with a HSC4 fork and look provided me with 30mm of spacers. I called veltec and asked them what was recomended and they said that the ideal stack is 20mm or less. You can put up to 30mm but no more. You really shouldnt need more than that, and if you do, try to make it up in the stem rise.

FWIW I tried my bike with 30mm for fun and it was way too flexy. I am at 20mm now with 5mm above the stem but I am even thinking about going down to 10mm below the stem to increase the the stiffness even more.

There is no difference in the spacers other than looks and perhaps a little bit of weight.

Also remember to measure twice and cut once.
re: Spacers on Look HSC3 Forkpmf1
Jul 25, 2002 9:15 AM
Maybe the Look or Reynolds site has some info.

My LBS has told me several times that the max is 2 cm. That's what mine is cut at. Even the fork (Reynolds Ouza Pro) I'm putting on my wife's bike (she weighs 120 lbs) is cut to 2 cm. I trust this shop (Spokes in DC area). They sell lots of high end bikes and their mechanics are not a bunch of kids.

I doubt the material the spacer is made of makes any difference.
Reynolds spacer limit...PsyDoc
Jul 25, 2002 11:27 AM
...on an Ouzo Pro (1 1/8") is 3.81cm. One shop told me that 4cm was limit, but that seemed high so I called Reynolds. They said not to exceed 3.81cm. He said 4cm would probably not cause any failure problems, but would void the warranty.
Reynolds spacer limit...pmf
Jul 25, 2002 11:33 AM
How about on the 1"?
Reynolds indicates not more than 2.5cmPsyDoc
Aug 2, 2002 9:39 AM
Rider size and Riding style matter tooelviento
Jul 25, 2002 9:56 AM
I'd imagine a 185lb sprinter would put MUCH more load on the steerer than a 110lb spinner (wouldn't be surprise if the former is more than 3-4 times the latter). In fact if you are a spinner, you put very little load on the steerer.

If you have a small female rider who doesn't ride aggressively, I doubt she will snap that steerer even if you have 4-5cms of spacers. But companies don't want the law suits so recommend less than 3cm.

One other thing, if you flip a 12cm -15 degree stem (like a Ritchey), you gain 6cm extra bar height (or 4cm+ compared to a standard 80 degree stem). If that's still too low with 3cm spacers, then:

1), check fit; or
2), use alloy steerer model, Most brands have that option.
re: Spacers on Look HSC3 Forkteschrider
Jul 25, 2002 11:27 AM
I've got a HSC3 fork with 2 cms of spacers and haven't had any problems with flex. However, I would not recommend any more than that. I weigh 175#'s.
re: Spacers on Look HSC3 ForkBroomwagon
Jul 25, 2002 6:54 PM
Thanks to everyone for your help. I knew that I would get useful info from you folks.

Thanks again.