FSA

KFX Di2 Carbon Seatpost - 400mm Length, 0mm Offset

FSA KFX Di2 Carbon Seatpost is a performance-focused mountain bike seatpost built for riders who want carbon comfort and a cleaner electronic drivetrain setup. Designed to suit modern trail and XC bikes, it pairs a lightweight, strong carbon construction with Di2 internal battery integration to reduce clutter and protect the battery inside the bike for a streamlined build.

With a 400mm length and 0mm offset, this post targets riders who want a more centered, forward-biased saddle position without sacrificing the controlled compliance carbon is known for—helping take the edge off trail chatter while maintaining solid pedaling support on demanding terrain.

• Carbon construction - balances vibration-damping compliance with the stiffness needed for precise pedaling and control
• Di2 internal battery integration - keeps the electronic drivetrain battery tucked away for a cleaner, more protected setup
• 400mm length - supports a wide range of fit needs, including taller frames and extended saddle height requirements
• 0mm offset - positions the saddle more directly over the post for riders optimizing reach and pedaling position on modern MTB geometry
• Built for trail and XC use where low weight and real-world durability both matter