EK Chain

About EK Chain (Enuma Chain)

Since 1941, EK Chain — the brand name of Enuma Chain Manufacturing Co., Ltd. — has been crafting precision roller chains from its headquarters in Kaga, Japan, a city nestled along the country's western coast near Komatsu. What started as a general-purpose roller-chain manufacturer has evolved over eight decades into one of the most respected names in the global motorcycle chain industry.

EK Chain's defining moment came in 1974, when Enuma engineers introduced the world's first sealed O-ring chain. This breakthrough was not a minor refinement — it fundamentally changed how motorcycle drive chains retained lubrication and resisted contamination. By sealing grease between the inner and outer plates using rubber O-rings, the design dramatically extended service life and reduced maintenance intervals. That spirit of engineering innovation has defined the brand ever since.

A Legacy of Precision Engineering

Manufacturing in Japan demands exacting standards, and EK Chain has built its reputation on precisely that. Every link, plate, and pin that leaves the Kaga facility is held to tolerances that reflect decades of refinement. The result is a product line trusted by OEM motorcycle manufacturers as well as serious enthusiasts who understand that the drive chain is a critical link — literally — in the power delivery system.

The company's catalog centers on its renowned drive chains, which span a wide range of pitches and widths to fit everything from lightweight commuter bikes to high-displacement sport and adventure motorcycles. These chains are engineered to handle the cyclical stress of acceleration, braking, and everything in between, maintaining consistent tension and smooth engagement throughout their service life.

The EK Chain Product Range

At the heart of the lineup are EK's chains, available in standard roller, O-ring, X-ring, and other sealed configurations. The progression from the original O-ring design to modern X-ring geometry reflects EK's ongoing investment in reducing friction while maximizing the seal's effectiveness — two goals that pull in opposite directions, and that EK's engineers have spent years balancing.

For riders performing maintenance or repairing an existing setup, EK also supplies drive chain links — including master links and connecting links — so that a worn or damaged section doesn't necessitate replacing an entire chain. Having access to properly matched links matters: mixing components from different manufacturers can compromise tension and alignment, so sourcing EK links for an EK chain keeps the entire drivetrain working as intended.

Why Riders Choose EK Chain

• Over 80 years of chain manufacturing experience based in Japan
• Inventors of the world's first sealed O-ring motorcycle chain (1974)
• Wide product range covering standard, O-ring, and X-ring chain types
• OEM supplier to major motorcycle manufacturers worldwide
• Comprehensive chain link selection for maintenance and repair

Whether you're chasing lap times, logging long touring miles, or simply keeping a daily rider in top condition, EK Chain offers a solution engineered to the standards that serious riders expect. Explore the full range of EK chains and drive chain links to find the right fit for your application.