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FSA
Compressor 1-1/8 Expander Plug and Top Cap

$13.99ea.
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The FSA Compressor Plug is a top assembly for forks with carbon steerer tubes. Replaces the traditional top cap/star-nut assembly to set the pre-load for headset bearing adjustment. Fits 1-1/8" steerer tubes. Includes cap, bolt, and expander. 53g.

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Well made & an super alternative to the star nut on alloy steerer tubes, too.
by BF (North County Cycle Club)
Competitive Racer
San Marcos, CA
1 of 1 customers found this review helpful.

I find that this compressor/expander plug opens more fine tuning/adjustment possibilities when setting up a headset. This is the only kind of top cap assy. I use on my racing bikes. in my opinion, this kind of part makes the star-nut design obsolete.

Reviewed 5/15/2014
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easy to use - works like a charm
by Anonymous
California
1 of 1 customers found this review helpful.

easy to use - works like a charm

Reviewed 12/25/2014
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Best design, ever!
by Paul
Competitive Racer
DC
1 of 2 customers found this review helpful.

I started using FSA's expander plug a few years ago, per the advice of my LBS. Now it's on all my cyclocross and road bikes because it's easy to set up and keeps your headset locked down snug without worry. Unlike other plugs that have shims and small parts that can come loose and fall into your steerer tube, FSA's plug is one unit with two adjustment points-the expander bolt and top cap. Once you've set the expander, tighten the cap, then stem bolts, and you're ready to roll. Too easy.

Reviewed 10/1/2012
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