Bottom Bracket, Shimano, UN73 (68 – 113)

Description

The Bottom Bracket, Shimano, UN73 (68 – 113) is a reliable replacement schwinn airdyne bike parts component designed to restore smooth crank rotation and stable pedal performance on compatible Schwinn indoor bikes. Built for the Pedal Drive & Fan Assy section, this cartridge-style bottom bracket fits select Schwinn Airdyne Evolution models that use a 68 mm shell and 113 mm spindle length.

• Compatible with select Schwinn Airdyne Evolution bikes using a Shimano UN73 bottom bracket configuration.
• Designed for applications requiring a 68 mm bottom bracket shell width and 113 mm spindle length.
• Suitable replacement for worn or noisy pedal drive & fan assy parts bottom bracket assemblies in matching Schwinn units.
• Commonly used when replacing a damaged or rough-running schwinn bottom bracket shimano cartridge in the crank area.

This sealed cartridge bottom bracket is engineered for dependable performance, helping reduce play, grinding, and resistance caused by bearing wear. The Shimano UN73 design is known for its durable internal bearing construction and consistent alignment under repeated use. It is an OEM-style replacement intended for bikes originally configured with the same size and thread standard, though buyers should always confirm shell width, spindle length, and crank compatibility before ordering. Installation is typically considered a moderate DIY repair and usually requires the proper crank puller and bottom bracket removal tools for safe, accurate fitment.

Choose this OEM-quality replacement for smooth pedaling, dependable fit, and fast shipping from our warehouse.