Spindly brake calipers cant effectively stop a speeding bike. The new Ultegra 6700 brakes not only have a rigid caliper to slow the wheel, but also a cam in the levers that provides mechanical advantage and modulation. With new pad compounds, the braking power is 20% better in the dry and has actually doubled in wet conditions. By conserving energy expended in stopping and modulating, riders can simply go faster, and longer. New super SLR design : Enhanced brake arch pivot location for quick linear response. Low profile outer cable stop : Improves cable routing for reduced friction especially with sloping frame. Adjustable toe in brake shoes.