Park Tool Freewheel Remover Shimano Hyperglide

To work on a Shimano Hyperglide (HG) system, it is critical to identify whether your bicycle uses:

• A modern slide-on HG Cassette, or
• A vintage thread-on HG Freewheel.

These two configurations utilize entirely different tool architectures.

Key Details to Consider:

• Identical Tool Interface: Both configurations feature a 12-spline, ~23.4mm diameter tool interface.
• Compatibility Issue: A standard cassette lockring tool has splines that are too shallow to reach past the protruding axle hardware of a threaded freewheel.