The bicycle gear system has not changed in 100 years. That is, until industrial design student Chris Holloway came up with his Link gear system.
As a downhill bike racer, Holloway wanted a better system. His Link gear system is an expanding chain ring gear with four segments that expand and contract to give three different gear ratios.
Advantages include seamless shifting, higher efficiency, longer chain and sprocket life and improved weight distribution.
Importantly, you can swap out your current gear system and install the Link system.
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