The Most Tiger Ultra Lite Aero 1K Di2 Compatible Stem. Updated in 2018 with special routing for Shimano Di2 R9150, ensuring compatibility with your electronic drivetrain. This lightweight stem achieves a perfect fit with Pinarello's aero spacers. Carbon 1k construction maximizes stiffness, giving you precise handling desired from your carbon superbike. Moreover, the matte raw-carbon finish exudes a stealthy, modern aesthetic that blends beautifully with your Pinarello's cockpit.