Shimano 105 BR 5800 Caliper Brake Set. When Shimano upgrades a group no stone is left unturned as evident in the new Shimano 105 ST 5800 Caliper Brake Set. While the big story with the new Shimano 105 5800 componentry is the jump to 11 speed for the drivetrain, the brakes have definitely made noteworthy strides as well. First and foremost is the increase in stopping power 10% more than previous 105 brakes thanks to an updated dual pivot design. They're flat out crisper and smoother than ever before. And for those who prefer road tires on the fatter end of the spectrum, running 700x28 bad boys is not a problem at all.