AD4 BB Cartridge w/ Lock Ring

Description

The AD4 BB Cartridge w/ Lock Ring is a precision-fit bottom bracket cartridge designed to restore smooth crank rotation on select Schwinn Airdyne bikes. As one of the essential Schwinn Airdyne parts, it supports the pedal-drive assembly and helps keep your bike pedaling quietly, efficiently, and with proper alignment.

• Designed for select Schwinn Airdyne AD4 exercise bikes and related configurations using bottom bracket cartridge assembly 90960-SA.
• Commonly used in Airdyne AD4 pedal-drive systems where the original bottom bracket has worn bearings, excess play, or rough rotation.
• Replaces the airdyne pedal drive parts bb cartridge w/ lock style assembly with matching lock ring for secure installation.
• Also referenced by customers searching for a Schwinn BB cartridge w/ lock ring for older Airdyne restoration and repair projects.

This replacement bottom bracket cartridge includes the threaded cartridge body and lock ring needed to secure the assembly in the frame shell. Built to handle repeated indoor cycling use, it helps eliminate grinding, wobble, and resistance inconsistencies caused by worn internal bearings. This is an OEM-style replacement part intended for compatible Schwinn Airdyne models; always confirm your original part number before ordering. Installation is generally straightforward for experienced DIY owners or service technicians, though proper bottom bracket tools are recommended for removal and tightening.

Restore dependable pedal performance with an OEM-quality replacement that fits right and ships same day from our warehouse.