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Hypercracker ®
This was a handy tool for removing the lockring that holds the sprocket cassette to a Freehub.
It consisted of a fitting to engage the lockring, with a thin arm. The arm is bent and padded at the end, so that it will bump up against the frame's chainstay.
To use a Hypercracker, you remove the wheel from the frame, install the Hypercracker into the lockring, then put the wheel back in the bike. When you turn the pedals forward, the Hypercracker's arm bumps into the frame, and the cassette turns while the lockring is held immobile by the Hypercracker.
The Hypercracker is the only single tool that will remove a cassette lockring--normally, you need a lockring tool and a chain whip. Since the Hypercracker used the bicycle's drive train as a chain whip, it was particularly handy for the touring cyclist, because it was a small, easily portable tool. Unfortunately,the Hypercracker is no longer in production.
