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Universal Cycles -- Shimano Disc Brake Centerlock Rotor Lockrings [Y2A598030, Y8PV98010, Y8K198010, Y8PW98020]
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Amazon.com: Shimano XT RT-MT800-L 203mm Centerlock Disc Rotor with External Lockring : Sports & Outdoors
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Shimano GRX SM-RT64-S Disc Brake Rotor with External Lockring - 160mm, Center Lock, Silver - Village Pedaler
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