Sigma X Carbon Aero Stem
Sigma X Carbon Aero Stem
Sigma X Carbon Aero Stem
Sigma X Carbon Aero Stem
Sigma X Carbon Aero Stem
Sigma X Carbon Aero Stem

Sigma X Carbon Aero Stem

Regular price $350.00 Sale price$175.00
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When we first introduced the original Sigma, it was a revolution - the first stem on the market with integrated cable management. Since then it's been imitated by many others, but never surpassed ... until now. The carbon-fiber Sigma X is the next generation in clean stem design, borrowing technology from our Alpha X aerobar, and porting it to an aero stem. It comes complete with our aero-matched stem spacers, ultra-low-stack dust cap (1mm), and more.

Tech / Installation

All Carbon Construction

The new Sigma X is MUCH lighter and MUCH stiffer than its predecessor, owing to all-carbon construction. Now you can have an aero advantage without a weight penalty.

Born from Alpha X

The aero features from Sigma X were borrowed from our brand new Alpha X aerobar platform. The aero-matched spacers are identical, as is the wedge-style steerer clamp, and the removable centerpull cable stop. The Sigma X is basically the Alpha X, minus the bar.

No Fork Trimming

The new Sigma X eliminates the traditional drawback of integrated stems, which is the requirement of trimming your fork's steerer tube. The Sigma X cable cover stops just in front of the steerer tube, allowing you to maintain clean cable routing and also preserve the ability to change position in the future.

Integrated BTA Mount

The two bolts on top that affix the Sigma X cable cover --- those are spaced at 63mm for a water bottle cage or storage box. So you get a clean mounting option, no zip ties required.