Amazon.co.jp: Shimano BR-R7170 IBRR7170RDRF Rear Flat Mount Included / 2 x Fixing Bolts (for 1.0 inch (25 mm) Mount Thickness, No Mounting Bracket, Resin Pad Fins, Medium : Sports & Outdoors
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Amazon.co.jp: Shimano EBRUR300F6RXL ALTUS BR-UR300 Disc Brake, Front Use, Resin Pad (B01S) Flat Mount, Hydro Rick : Sports & Outdoors