AliExpress alternative to the Cassette Spacers

An exact match cannot be confirmed. The Berm Peak video does not name the brand, thickness, or material of the spacer used. The AliExpress listing covers the correct functional category, cassette and freehub spacers, but without a reference spec, buyers should treat this as a functional equivalent rather than a verified identical part. If your hub requires a specific thickness, measure the gap first and confirm the variant with the seller.

Most freehub body spacers used to adjust cassette positioning run between 1mm and 2mm thick. Shimano hubs commonly use a 1.85mm or 1mm end-cap spacer; SRAM and generic hubs vary. Measure the gap between your cassette lockring face and the dropout with calipers before ordering. The AliExpress listing does not specify thickness per variant clearly, so messaging the seller with your measurement before purchasing is worth the extra step.

Cassette spacers are largely standard across MTB and road hubs that share the same freehub interface width (e.g., standard 8/9/10-speed Shimano HG). However, newer standards like Shimano Micro Spline (12-speed MTB) and SRAM XD/XDR use different freehub body diameters and may not be compatible with a generic washer. Confirm your hub standard before assuming universal fit.

The AliExpress listing does not specify material grade. For low-stress applications like end-cap spacing or cassette shimming on a casual or commuter bike, most alloy or steel spacers hold up fine. For high-torque downhill or e-bike drivetrains, a hardened steel spacer from a named supplier is a safer choice. At $0.54, the risk of material failure is worth weighing against your riding intensity.

Cassette spacers used to move the cassette laterally on the freehub body can shift chain line by the spacer thickness, even 1mm can affect front derailleur trim on some setups. If you are adding a spacer to an existing build rather than replacing a lost one, recheck derailleur limit screws and cable tension after installation. Bottom bracket spacers from this same listing would require separate chain line verification.

A 1.85mm spacer is the standard shim used to fit a 10-speed HG cassette onto an older 8/9-speed Shimano freehub body. If the AliExpress variant you select matches that dimension, it is a well-documented conversion. Confirm the listed variant is 1.85mm and that the outer diameter clears your freehub body before ordering, the seller should be able to confirm this via the AliExpress messaging tool.