Shimano Cyclus cassette tool

Which tool to remove a Shimano SIS or HG cassette ?

When working on your bike, one part that often needs removal is the cassette. Whether it’s for a deep clean, replacement, or gearing upgrade, a proper Shimano cassette tool is essential for a clean and safe removal process.

In this article, we’ll explain how to choose the right cassette removal tool for Shimano systems, specifically SIS and Hyperglide (HG) models, and outline their key features.

What is a Shimano cassette tool used for ?

The cassette, mounted on the rear wheel, is made up of several sprockets that control your gear shifts. Over time, wear and grime can affect the smoothness of your drivetrain. The Shimano cassette tool is designed to loosen the lockring, allowing you to remove the sprockets safely and efficiently.

It’s one of the most essential bike tools for any cycling mechanic or enthusiast.

Compatibility: Shimano SIS and HG

Shimano offers different types of cassettes:

• SIS (Shimano Index System): an older but still common shifting system on entry-level bikes.

• HG (Hyperglide): widely used on road bikes, MTBs, and gravel bikes, offering smoother gear transitions.

The good news: both SIS and HG cassettes use the same lockring interface. That means a single Shimano cassette tool works for both systems.

Key features of the Shimano cassette tool

Here’s what to look for when choosing a reliable and durable tool:

✅ Shimano splined interface

• The tool should have 12 internal splines, matching the Shimano lockring.

• The internal diameter is approximately 23.4 mm.

✅ Durable construction

• Made of hardened steel to withstand high torque.

• Some models include an anti-corrosion coating for longer lifespan.

✅ Center pin option

• Versions with a guide pin help align the tool precisely on the lockring.

• Some models feature a through-hole for use with a quick-release skewer, keeping the tool securely in place during use.

Other tools you’ll need

The Shimano cassette tool doesn’t work alone. To properly remove a cassette, you’ll also need:

• A chain whip: holds the cassette still while you unscrew the lockring.

• A wrench or adjustable spanner: used to turn the cassette tool if it doesn’t have a built-in handle.

Pro tip

Before removing your cassette, clean the area to prevent dirt from entering the freehub. This is also the perfect time to inspect your sprockets, freehub body, and check your chain for wear.

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Conclusion

A Shimano cassette tool is a must-have for maintaining your drivetrain. Whether you ride MTB, road, or commuter bikes, knowing how to remove your cassette gives you independence, better performance, and a longer lifespan for your components. Investing in quality bike tools means working with precision and enjoying the process of bike maintenance.