Seller notes

KKE 50T Rear Sprocket for Surron Ultra Bee Back 520 Chain Sprockets Blue BikeFeature Color: Anodized blue, last a long timeMaterial: Constructed from 7075 aerospace aluminum alloy. The weight is 1/2 of other ordinary sprockets, but the strength is enough.Advantage: Lighter, stronger and more durable than stock sprocketUltra precision machine cut for super light weight construction, high precision and qualityDirect replacement for stock sprocket. No modification needed Fit for chain size: 520 ---...

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