TRP - TR33 Two Piece Disc RotorsTRP TR33 TWO PIECE DISC ROTORS TRPs two piece rotors offer superior heat dissipation due to the aluminum center as well as excellent stiffness to provide you with confidence in your braking and lighter weight in 180 203mm sizes. Two piece is now combined with TRPs new slotted rotor is design. Six recessed slots create channels to allow water, mud, and other debris trapped between the pad and rotor to escape under braking. When debris gets trapped