The 105 5800 disc brake groupset from shimano is now not only 11 speed but also comes ready for disc brakes it features the drip down trickle of technology through shimanos technological developments which means this group set now has slicker and smoother shifting thanks to its sil tec polymer treatment as well as more powerful braking capabilities the groupset comes with hydraulic post style disc calipers and is supplied without disc rotors so you can choose your ideal one