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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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Reviewed 12/25/2014
by Anonymous
California
Value Rating
Overall Rating
1 of 1 customers found this review helpful.
easy to use - works like a charm

easy to use - works like a charm

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Reviewed 10/1/2012
by Paul
Competitive Racer
DC
Value Rating
Overall Rating
1 of 2 customers found this review helpful.
Best design, ever!

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.

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Reviewed 5/15/2014
by BF (North County Cycle Club)
Competitive Racer
San Marcos, CA
Overall Rating
1 of 1 customers found this review helpful.
Well made & an super alternative to the star nut on alloy steerer tubes, too.

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.

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