The chain is the heart of a bicycle: what connects it, what drives it, what animates it. Izumi has been making chains for over a century, and only chains. That singular focus gives us an unparalleled advantage in developing new innovations and improvements in quality and performance

The roller chain is one of the most vital technologies mankind has ever created. First envisioned in a sketch by Leonardo da Vinci (or one of his many assistants) around the turn of the 16th century, roller chains weren’t practically invented for almost another 400 years. But without them, the modern bicycle—in fact, many aspects of manufacturing and transportation—wouldn’t be possible. The heart of the bicycle drivetrain, a chain is an engineering marvel, with hundreds of individual parts forming a whole that is capable of almost 99 percent efficiency in power transfer. At Izumi, we’re obsessed with chain technology; that’s why companies like Shimano, the world’s largest cycling component maker, and even other specialist chain manufacturers like Tsubakimoto Chain, trust us to make their chains. Explore below to discover what drives us

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