Shimano Flat-Mount Road Disc Rear Caliper Fixing Bolt C C2 BR-R8170/9170/8070
The brake caliper is either attached directly to the chain stay (with a 140 mm brake disc) or via an adapter (with a 160 mm brake disc).
The brake caliper is either attached directly to the chain stay (with a 140 mm brake disc) or via an adapter (with a 160 mm brake disc).