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Source Factory Premium 520 X-Ring Motorcycle Chain Matches Did 520vx2 Durability & Low Friction. Enhanced Durability: Extends service life by 1.5x compared to standard chains due to advanced heat treatment. Low Friction Design: X-Ring technology reduces friction, lowers wear, and ensures quiet operation. High Tensile Strength: Made of premium alloy steel with a tensile strength of 38 kN for stable power transmission. Versatile Application: Suitable for street bikes, racing motorcycles, and off-road vehicles up to 800cc. Lifetime Warranty: Provides free replacement for products and technical support against manufacturing defects. OEM/ODM Support: Supports customization services including OEM and ODM for aftermarket chains.