Koryak Di2 Stem

What Our Gearhead® Experts Are Saying:

"The PRO Koryak Di2 Stem is the stem I reach for on any trail or all-mountain build running an electronic drivetrain where cockpit integration is a priority. The internal Di2 routing paired with a PRO BTR Expander produces a front end that looks and functions like a purpose-built system rather than an afterthought, and the 3D forged AL-7075 CNC construction gives it the stiffness and precision fit of a stem that costs significantly more. The plus or minus six degree rise and 100mm length cover the majority of trail geometry setups without requiring a stem swap to get the bar height right."

Electronic drivetrains have transformed shifting performance on mountain bikes, but the cable routing demands of Di2 systems have historically required compromises in cockpit cleanliness that mechanical setups never faced. The PRO Koryak Di2 Stem was engineered to resolve that tension entirely, providing a dedicated internal routing path for Di2 cables that keeps the front end of an electronic trail or all-mountain build as clean and integrated as the drivetrain technology it supports.

When paired with a PRO BTR Expander, Di2 cables route through the stem body rather than along the exterior of the bars and steerer, protecting them from trail debris, branch strikes, and the general mechanical wear that externally routed cables accumulate over a season of hard riding. The result is a cockpit that functions with the reliability and precision that electronic shifting demands while presenting the clean aesthetic that a purpose-built system should deliver. The stem is forged from 3D AL-7075 aluminum and CNC machined to remove material selectively, producing a component with the stiffness-to-weight ratio that performance trail and all-mountain riders expect from a front end component at this specification level.

The plus or minus six degree rise provides meaningful adjustment range during bike fit and setup, allowing the rider to optimize bar height relative to saddle height and reach without committing to a fixed rise that may not suit the frame geometry or rider position. The 100mm length positions the stem within the range most commonly used on current trail and all-mountain geometry frames, working in conjunction with wider handlebars to deliver a front end that balances steering precision with stability on technical terrain. The two-bolt steerer clamp provides secure and even clamping force on 1-1/8 inch forks, while the four-bolt removable faceplate simplifies handlebar installation, adjustment, and future swaps across the life of the build. Full compatibility with PRO's Di2-capable handlebar ecosystem means the Koryak Di2 Stem functions as part of a cohesive integrated cockpit system rather than a standalone component.