SunRace MFEX9 Freewheel - 9-Speed, 11-32T, Chrome

SunRace MFEX9 Freewheel - 9-Speed, 11-32T, Chrome is a new replacement drivetrain component for bicycles using a 9-speed rear drivetrain. The CSV identifies it as a threaded freewheel with a 11-32T gear range and a chrome finish. It is listed under SunRace manufacturer reference MFEX9.9AU0.CS1.BX.

This component is intended for riders replacing a worn rear gear cluster or configuring gearing for the bicycle’s intended terrain. The smallest and largest sprockets define the available range: smaller high-gear sprockets support speed, while larger low-gear sprockets reduce climbing effort. Actual shifting performance depends on using the correct chain speed, shifter indexing, rear derailleur capacity, and compatible hub interface.

Before ordering, confirm whether the bicycle uses a cassette mounted to a splined freehub body or a threaded freewheel. These systems are not interchangeable even when the speed count and tooth range are the same. Also verify derailleur maximum-cog capacity and total drivetrain capacity. A chain may need to be resized when the largest sprocket changes, and a worn chain can cause skipping on a new gear cluster.

Professional installation is recommended when compatibility is uncertain. Installation normally requires the correct removal tool and, for cassettes, a chain whip and lockring tool. After fitting, the rear derailleur indexing, limit screws, B-gap, chain length, and shifting across every sprocket should be checked. Acadiana Bicycle Company can identify the hub standard, confirm compatibility, install the component, and inspect the chain and chainrings for wear before returning the bicycle to service.