* Alloy brake and shift levers* 11 Speed DoubleTap with Zero-Loss shifting* 2-Piston open system * Piston Size: Fr 19mm, Rr 18mm * 2-Piece forged aluminum caliper w/ top loading pads * For 140 or 160mm rotors* Compatible with 11 speed derailleurs only* -01, -02 : Post Mount; -03,-04: Flat Mount”