If you seek to run a 1x drivetrain and a dropper on your drop bar bike this is the kit for you. 

Featuring all the same proven tech as the 2x11 GRX group, this version gets a rear derailleur optimized for one-by use and cleverly integrates dropper actuation into the left-hand brake lever so you don’t have to take your hand off the brake hoods when things get shreddy.

This kit includes a shifter/dropper actuator, hydraulic disc brake calipers, rear derailleur, chain, and 11-42 cassette.