Profile Design Sonic/Ergo 39A Tri Bars Shokz Drivetrain features 175 mm two-piece

Drivetrain features 175 mm two-piece tubular chromoly hollow spindle cranks with a 25T aluminum chainring and mid sealed bearing bottom bracket

so you can feel good about really working up a sweat

Quicker lever access and light operation force maintains rider concentration20% quicker lever access time-35% shifting operation force (vs

predictable grip across the entire profile no matter the lean angle

Profile Design Sonic/Ergo 39A Tri Bars Shokz Drivetrain features 175 mm two-pieceThe Sonic bracket offers an extensive fit range, low weight and easy adjustment along with minimal frontal area. Combining this with the Ergo armrest creates an aerobar that will aid most riders in optimizing their position for both speed and comfort. The 39a extensions have a 39 for the grip . The rider can choose whether to hold high for the shrugged position or low for a more open, head up position.