Top-tier steel #428 split sprockets designed for durability and long life under demanding race conditions. Manufactured by RK Japan, these high-quality sprockets may be branded as RK, XAM, AFAM, or NKP—all produced to the same exacting standards.
NOTE for 18T: The machined groove in RK gear is too narrow for DID & Regina chains. Use PANTHER #428 CHAIN for proper fitment on this size
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Precision-machined from high-strength steel for maximum durability
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#428 split design allows quick sprocket swaps without removing the axle
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Standard 2mm center gap for secure mounting and consistent alignment
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Fits standard 50mm axle carriers
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Built for racers seeking longevity and reliability in all conditions
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May be branded RK / XAM / AFAM / NKP – all made by RK Japan
