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FSA Compressor Expander Plug and Top Cap

Item #: HS257Y00
USD$12.99 SAVE 6% USD$13.75 msrp
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FSA Compressor Expander Plug and Top Cap

FSA Compression Plugs are top assemblies for carbon steerers. Replaces the traditional top cap assembly. Includes cap, bolt, and expander.

    * Top assembly for carbon steerers replaces traditional top cap and star nut assembly
    * Compressor Carbon Pro has carbon fiber top cap
    * Includes cap, bolt and expander

4.2 / 5.0
6 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
3
1
2
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An Advance Over Star Nuts
The FSA compression plug is so more elegant than a star nut as you can remove it easily should you want to recut your steerer tube. This permits you you to cut the tube a little long at first to experiment so you know the exact length you need. Also, if you upgrade the fork you can remove it and re-use it. Anyone who has trouble installing this plug is out of their league for doing fork installations, it is simple but you need some mechanical aptitude. Getting it snug enough was easier if you use the T-handle type of allen wrench but not essential. I use these even on alloy steer tubes because they are removable and easy to install.

PROS: Easy to remove, Easy To Install

CONS: Star Nuts Are Free
July 9, 2012
Location:
Boston, MA
Strong Neck
The FSA headset is a great product with not movement and tough design, it is easy to take out and clean and then put back in. The only problem so to say is that it has no style, it looks boring and plain.

PROS: Easy to take out, No movement, Strong

CONS: Not Visually Pretty, Plain Boring
February 24, 2012
Location:
Little Mountain QLD
Perfect for carbon steering tube!
Perfect for my Lynskey carbon fork and sterring tube! Nice quality!
July 14, 2017
Location:
Orange County ca
A star-nut alternative that works!
I hate star nuts, so I have tried a couple of alternatives. The others did not grip the steerer tube securely enough, so I couldn't get the headset tight enough, so I went back to star nuts.

But I decided to give this one a shot before giving up on the idea completely. It works just as well a star nut. And there's no star nut to go off-axis, or to interfere with cutting the steerer tube, or to get pushed down too far by accident, etc.

The only drawback is that it took some tinkering to find the sweet spot where it slides in but yet it grips the steerer just enough that you can tighten it. If too loose, it just spins when you try to snug it up.

PROS: Never Goes Off-axis, Quality Construction, It Just Works

CONS: Install Took Three Tries
July 21, 2014
Location:
Duthie Hill
Nice option.
As mentioned above when installing a fork the expanded plug can slip in the steerer tube. Degrease and try again if it does. Mine worked well after. Instructions do specify for road use only and so far so good on my commutor.

PROS: Quality Construction, Allows Easy Fork Install

CONS: Can Slip A Bit
August 13, 2013
Location:
Maui
Wish they included some instructions.
FSA does not include instructions nor are they available on their site so it took a bit of searching online and taking the thing apart to figure out the basic of it. It's actually 2 parts in one. The compressor part with it's own bolt and the top cap.

I'm still unable to get tight enough to bind the fork so I'm unsure how much preload you can actually get on this.

If FSA would just put instructions online with as far as installation depth of the compressor and torque ratings that would help a lot.

CONS: Lack of instruction
February 23, 2012
Location:
San Francisco, CA

Q & A

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Browse 2 questions Browse 2 questions and 6 answers
will this fit a 1 1/8 steering tube?
bob m on Jul 12, 2017
BEST ANSWER: Yes it will, but I don't recommend it. It doesn't offer support from the inside steerer tube (carbon) when clamping on the stem which can crush. headset usually fill the hole and make the tube solid when clamping.
Can you use a different top cap with the plug assembly?
Matt B on Aug 6, 2017

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Free Shipping Offer

Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.