Tharsis Trail Stem

What Our Gearhead® Experts Are Saying:

"I specced the PRO Tharsis Trail Stem on a trail build and the combination of forged AL-7075 construction and titanium bolts gives it a stiffness and precision feel that you notice immediately on technical terrain. The integrated external headset adjuster is a genuinely useful detail that simplifies setup without requiring anything beyond the tools already in your pack, and the Di2 battery routing through the steerer is clean and well thought out for electronic builds."

A trail stem needs to be short enough to keep steering snappy, stiff enough to handle repeated impacts without flex, and light enough to justify its place on a performance build. The PRO Tharsis Trail Stem checks every one of those requirements and then adds a handful of details that make it genuinely easier to set up and run than anything else at its weight.

Forged from AL-7075 aluminum with titanium bolts, the stem weighs just 95 grams at 65mm while delivering the rigidity that rough trail terrain demands from the front end of the bike. The integrated external headset adjuster replaces the traditional star-fangled nut or expander plug setup with a cleaner and more accessible system, letting you dial out steerer play from outside the tube with minimal tools. For riders running Di2 with an internal battery, the stem and included top cap accommodate battery installation inside the steerer when depth exceeds 152mm, routing the wire cleanly through and over the stem with the included BTR expander nut and battery hanger.