ABOUT OUR BUILD KITS:
All build kits include all parts in the specified groupset. For example, if you select a Shimano Ultegra group, ALL parts are from the group. So, that means you will get ultegra level shifters, cranks, cassette, chain, brakes, bottom bracket, etc. There is no skimping in the groupsets with lower end parts that you do not see... (for example, putting a low end chain and cassette to save money)
For cable actuated disc brakes, we select the closest model for the specified group.