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Hi, welcome to my channel Today I will introduce to you 2-layer disc brake This disc brake is usually used for racing cars like road bikes It has 2 layers It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for road bikes It is usually used for