SRAM RED AXS Aero Power Meter Chainring Kit - 44t, 12/13-Speed, 8-Bolt Direct-Mount, 6.5mm Offset, Black, E1When you need the absolute best from your training data, the pro proven accuracy and reliability of the RED AXS power meter is the way to go. Integrated into the chainring itself, it's light, stiff and aero, accurate to + 1. 5% even as weather conditions change, and retains chains even when you hit rough stuff. AXS enabled for easy monitoring and firmware upgrades Single ring drivetrain simplifies functionality Fully integrated power meter into a