Vortex 520 Conversion CAT5 Series Rear Sprocket 44T Black fits Yamaha YZF-R1

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Vortex Cat5 520 Rear Sprocket Conversion - 654AZK-44

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VORTEX Aluminum Rear Sprocket 654AZK-44

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Vortex CAT5 Rear Sprocket 654AZK44

VORTEX - 654AZK-44 - Aluminum Rear Sprocket for Yamaha YZF-R1