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Full Carbon Fork Questions

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Full Carbon Fork Questions

Old 08-10-09, 08:55 PM
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ridethecliche
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Full Carbon Fork Questions

I'm running a cannondale full carbon fork.

Quick question:

1) Should there be anything between the brake bolts and the fork? My fork with an AL steerer tube had an AL insert in the fork. This fork doesn't. I was wondering if a washer between the fork and the brake was necessary. The shop said it wasn't, I'm just making sure.

2) For the Cannondale SI headset plug whatever, are you supposed to be able to have a spacer above the stem?

3) How many CM of spacers are allowed below the stem?

Thanks!

Last edited by ridethecliche; 08-10-09 at 09:29 PM.
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Old 08-10-09, 09:15 PM
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1) Nope, you should be fine. Don't most CF forks have some texturing around the brake hole?

2) No idea about Cannondale stuff, but I don't know of any steerer plugs that don't allow spacers above the stem.

3) That depends upon how far the top of your stem extends above the steer tube, but I wouldn't do any more than 1.5 cm, and that's quite a lot. 0.5 or 0 is even better. This isn't necessarily a CF fork specific thing. It's just that it's possible to strike a big stack of spacers and cause them to move, which would mess up your headset adjustment. In theory, there's no reason that you couldn't have a whole meter of spacers on top of the stem, it's just that, as a practical matter, they tend to get in the way and render your adjustment more vulnerable. And of course, once you get the fit dialed in, I would have no more than 5mm of spacers over the stem.
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Old 08-10-09, 09:32 PM
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ridethecliche
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Sorry, I mistyped the 3rd question.

I was wondering how high I could run the stack under the stem.

I have long legs short torso syndrome, so I currently have about 4 cm under the stem because I just got the fork and couldn't cut it yet.

After I see your friend Carl at NEBC on friday, I think I'm going to see if I can reduce it to 3 cm. That should be more than reasonable.

I think cannondale's stock pictures on their website show about 3 cm of spacers under the stem.
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Old 08-11-09, 06:54 AM
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Originally Posted by ridethecliche View Post
Sorry, I mistyped the 3rd question.

I was wondering how high I could run the stack under the stem.

I have long legs short torso syndrome, so I currently have about 4 cm under the stem because I just got the fork and couldn't cut it yet.

After I see your friend Carl at NEBC on friday, I think I'm going to see if I can reduce it to 3 cm. That should be more than reasonable.

I think cannondale's stock pictures on their website show about 3 cm of spacers under the stem.
On that one, I'm not sure, but 3-4 cm is probably fine. Recommendations on spacer height limits are generally conservative. I would ask Mickey (the other guy at Spooky), though I'm not actually sure that Carl does his fitting in the same office anymore.
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Old 08-11-09, 08:08 AM
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ridethecliche
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Yeah, I sent C'Dale an email so I'll see what they say.

I think 3 should be fine.

I'm hoping to go less drop and more reach.
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Old 08-11-09, 09:08 AM
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I would not use spacers above the stem. The Cannondale Si headset plug is meant to go into the steerer tube and support the steerer under the pressure from tightening the stem. If there is a spacer, it cannot go in far enough and support the steerer. I would be careful about the height of the bars before you get the steerer cut, don't want to be uncomfortable with the bars being too low.
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Old 08-11-09, 09:27 AM
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Originally Posted by Acbike View Post
I would not use spacers above the stem. The Cannondale Si headset plug is meant to go into the steerer tube and support the steerer under the pressure from tightening the stem. If there is a spacer, it cannot go in far enough and support the steerer. I would be careful about the height of the bars before you get the steerer cut, don't want to be uncomfortable with the bars being too low.
The instructions for the EC90 SL (Easton's Full carbon fork) suggest that you leave a bit of steer tube above the stem (few mm) and then put a spacer above the stem, so in some cases you might actually need a spacer above the stem. Of course it does nothing for your bar drop.

I'm not sure why spacers above the stem would matter? As long as you put the plug in, its job is to compress the stem/spacer stack and preload the headset. I haven't seen the Carbon Cannondale Si plug, but FSA makes one that lets you use a standard plug (not with a starnut of course).
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Old 08-11-09, 10:01 AM
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The cannondale si full carbon forks have a different type of headset cap. It actually goes over an inch into the steerer. It is actually a plug not just a cap.
https://www.cannondale.com/asset/iu_f...uctions_en.pdf

If you have the plug pictured in this pdf, I would not recommend using spacers above the stem, since this reduces the amount that the plug goes into the steerer, which defeats the purpose of having it go into the steerer.. to support the steerer from the compression of tightening the stem.
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Old 08-11-09, 10:16 AM
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But I think that the point about not wanting TOO much spacer above the stem is a good one. I would think that you want that star nut as far down into the fork steerer as possible. Perhaps you set it down there and use a longer star nut screw to deal with a spacer above the stem? I guess all of this is why I still like the adjust-ability of the older quill stems, although the speed and simplicity of adjusting the no thread head sets is also much better.
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Old 08-11-09, 10:55 AM
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1) No.

2) No. (The top cap is a special top cap/plug that works best with nothing above it. In reality you can if you want but I wouldn't.)

3) 4cm. (Lawyer talk. You can do what you want though but after 4cm it does look ridiculous and I don't see a need to run more than 4cm of spacers.)
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