RK Sprockets from Japan, arguably the most reputable sprocket and chain manufacturer in the world, delivers top-tier performance with their #428 split sprockets. Built for serious racers, these are as good as they get.
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Made by RK Japan – trusted worldwide for premium chains and sprockets
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#428 split design – allows for quick sprocket changes without removing the axle
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No-gap fitment – engineered for perfect alignment; no shims or guesswork needed
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Ultra-lightweight and strong – CNC-machined from heat-treated 7075-T6 Ergal aluminum
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50mm axle compatibility – designed to fit standard 50mm axle carriers
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Race-proven durability – built to handle high-performance kart racing
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Branded RK or XAM – identical quality, both made by RK Japan