Shimano 105 5810 Direct Mount Rear Brake - Chainstay MountShimano 105 5810 Direct Mount Rear Brake Chainstay Mount The 105 BR 5810RS Direct Mount BB Brake Caliper offers increased aerodynamics and sharp, modulated braking out on the road. Fitting to the rear chain stays, this Shimano rear brake is tucked away from the wind for reduced drag, while the design allows adequate clearance for modern 28mm wide tyres. Completed with aluminium cartridge shoe holders and a quick release arm, this lightweight caliper