road BB7 or Spyre and pick any non hydro groupset. It's still shocking how many recalls are made for hydro brakes given they been on MTB for over a decade but just not AS weight weenie. I'll take the 1/4lb penailty from mechanical disc brake for reliability factors when decending down a 4000ft mt in 13 miles. My gripe with hydro/mech is that simply isnt enough brake fluid in the system to prevent boiling and brake fade on long decents. Palomar Mt has something like 88 switch backs in 6.5 miles before it opens up to less braking turns.