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2 Pairs Resin Semi Metallic Bike Disc Brake Pads 4mm Thickness Compatible With Ultegra R8020 BR R8070 K02 K03 K04 BR-RS805 : Amazon.co.uk: Sports & Outdoors
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shimano - Why do some disk brake pads use split-pins or bolts to retain metallic or resin pads? - Bicycles Stack Exchange
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