Product reviews:
Amazon.com : SHIMANO SG-3C40 Nexus Sprocket (23T) : Sports \u0026 Outdoors shimano nexus sprocket sizes
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Shimano SM-GEAR Sprocket for Alfine/Nexus 3-11 speed gear hubs Black 22T | eBay shimano nexus sprocket sizes
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Universal Cycles -- Shimano Nexus \u0026 Alfine Cogs shimano nexus sprocket sizes
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