EK Chain Automatic Transmission Drive Chain

EK Chain Automatic Transmission Drive Chains: Precision Engineering from Japan

When it comes to automatic transmission drive chains, few manufacturers bring the depth of heritage and innovation that EK Chain — the brand name for Enuma Chain Mfg. Co., Ltd. — delivers to every link. Founded in 1941 as a general roller-chain manufacturer, Enuma Chain is headquartered in Kaga, Japan, near Komatsu on Japan's west coast. That eight-decade legacy is not just history; it is engineering philosophy baked into every chain that leaves the factory.

A Legacy of Industry Firsts

EK Chain's most pivotal contribution to the drivetrain world came in 1974. Enuma introduced the world's first sealed O-ring chain, a design that dramatically extended chain life by inhibiting lubricant loss — a breakthrough that quickly became the standard throughout the motorcycle industry, and led to today's high-tech EK Quadra X-Ring chains that further prolong durability while reducing friction. Their factories are ISO 9001 certified for the highest levels of precision and safety. That kind of institutional commitment to quality control is exactly what buyers of transmission drive chains need to trust in a component handling constant mechanical stress.

Key Product Lines in the EK Chain Drive Chain Lineup

EK Chain's automatic transmission drive chain catalog spans multiple performance tiers, each engineered for a specific rider profile and power level:

• ZVX3 Series (Extreme NX-Ring) — The EK ZVX3 Series is the pinnacle of chain technology, with a tensile strength reaching 11,100 lbs, making it one of the strongest chains on the market, sealed with the most advanced NX-Ring (Narrow X-Ring). The ZVX3 range delivers an increased service life of 15% over the previous-generation ZVX2, and is suitable for 1000cc+ street and track bikes, or for applications where maximum strength and chain life is desired.
• SRX2 Series (Quadra X-Ring) — The SRX2 chains feature lightening holes on the side-plates for 3% weight reduction, reduced friction, and Quadra X-Ring design, which increases chain life from 1.5 to 2 times longer than a standard O-Ring chain. This makes the SRX2 an outstanding choice for performance street riders who want durability without paying a premium for race-grade hardware.
• L3D Series (NX2-Ring Street/Touring) — The L3D features NX2-ring technology for enhanced wear resistance, weight-reducing cutouts for improved performance, and a dimpled outer plate for added durability — making it well-suited for street and touring applications.
• Sport Series — The EK Sport Series is their best-selling line, offering great performance and value for unmodified street motorcycles; like all their products, these unsealed drive chains are made using solid roller construction and are pre-stretched for minimal adjusting after installation.

Competition-Proven, Track-Tested

EK's chains are utilized in international Superbike competitions and are the chain of choice in motorcycle drag racing. That race-day credibility translates directly into confidence for everyday riders: if a chain can endure the punishment of professional competition, it is more than ready for street and touring use. Continuous efforts on improvement of engineering, technology, quality, and manufacturing processes have enabled EK to offer a wide range of products, including micro-pitch chains, a broad line of power transmission roller chains, and special application chains.

Easy Installation with Patented Master Links

EK Chain also simplifies service. EK's screw-type master links do not require special tools for installation — this unique patented link gives a rivet-like fit using only an 8mm wrench and a pair of pliers. A number of chain color options are available, including chrome, black, gold, and even blue or red.

Whether you are replacing a worn OEM chain, upgrading for track performance, or sourcing for a touring build, EK Chain brings proven Japanese precision to every link. Browse the full selection of automatic transmission drive chains to find the right EK series for your application.