The ultegra series is pro proven as it is a direct trickle down from the dura ace group it stands for state of the art technology proven in pro races the ultegra 6800 series contains the following components brakes with new polymer coated bc r680 cables new brakes give smooth light operation with excellent modulation greater braking power modulation brand new slr with 2 axle symmetric brake caliper new brake shoe compound r55c4 adjustable toe in brake shoes spring tension adju