Over the past few years, TriRig has launched major redesigns of two of our three signature products. Alpha One aerobars, and Omega One brakes. Now, we complete the trio. TriRig is proud to introduce Sigma One, the most advanced stem we have ever designed.

Sigma One takes stem design to a new level, offering an integration and aero form unlike anything else on the market. Sigma One was born from our flagship aerobar, Alpha One. It is the first and only stem on the market which accepts a stack of mono risers, which integrate with the patented tilting Dragonfly cup mount from our award-winning Alpha One aerobars. This means Sigma One allows you to attach, remove, or adjust an entire aerobar setup with just two bolts.

In its base configuration, Sigma One is both the lightest and the most aero stem we have ever made, while retaining all the best-in-class features from its predecessor. Neat cable management and front brake cable routing are integrated into the design of the stem, but without the need for any fussy internal routing. Just run your cables as normal, then collect them beneath the cable cover and bolt down the top cap to lock everything in place. Both cabled and hydraulic housing fit easily through this routing system, and whether you’re on rim or disc brakes, Sigma One still offers the same tidy centerpull routing as every stem we’ve ever made.

Adding the optional Monopost Compatibility Kit takes the system to a whole new level. We took the same technology that makes Alpha One so special, then ported it to a stacked spacer setup so that it can function on Sigma One's stem clamp. Just two bolts set your stack, tilt, and lock everything in place.  Two bolts to install, two bolts to remove. Just as on Alpha One, you get a continuous tilt adjustment range from -5 to +17.5 degrees. Add in the extensions of your preference from our own world-class Gamma lineup, or use any industry-standard 22.2mm extension. Then top it all off with any of our Scoops Arm Cups, and you’re off to the races.

Sigma One is the ultimate solution to any road, tri, or hybrid bicycle. Whether you’re aiming for tri, offroad tri, gravel, century, or hybrid setups, Sigma One has you covered like nothing else on the market. In short, Sigma One isn’t merely an update on one of TriRig’s core products. It is the pinnacle of what a triathlon-oriented stem can be. 

Sigma One: Ride it Your Way.