Tharsis XC Stem

What Our Gearhead® Experts Are Saying:

"I spec the PRO Tharsis XC Stem on cross-country and trail builds where the rider wants a precise, low front-end position without a lot of excess weight at the cockpit. The integrated external headset adjuster is one of those details that makes setup significantly cleaner and easier than a conventional star-fangled nut system, and the titanium bolts keep the overall weight impressively low without giving anything up on clamping strength."

Cross-country riding rewards every gram saved and every degree of front-end position optimized, and the PRO Tharsis XC Stem was built with both of those priorities in mind. Machined from AL-7075 aluminum and secured with titanium bolts, it keeps weight low at the cockpit without asking you to compromise on the clamping strength and rigidity that a hard XC or trail effort demands from a stem.

The integrated external headset adjuster is the detail that separates the Tharsis from a standard stem. Built into the underside of the stem body, it replaces the star-fangled nut or expander plug entirely, letting you clamp the stem, dial out headset play from outside the steerer, and get riding without extra tools or internal hardware. On steerer tubes 152mm or deeper, the open steerer cavity accommodates a Shimano Di2 battery internally, keeping the cockpit clean and the battery accessible without any impact on your saddle height. Multiple length and angle combinations cover a wide range of rider positions and frame geometries across both XC and trail applications.