Shimano once again ups the ante with the Dura-Ace ST-R9270 shifter. Equipped with new Di2 wireless capabilities, Shimano claims 58% faster rear shifting and 45% faster front shifting-all while preserving the crisp, reliable gear changes we've grown to love from Di2. Enjoy 1. 5 - 2 years of battery life from a single button cell battery, along with refined ergonomics and a lighter, smoother braking action thanks to Servo Wave technology. These R9270 levers are designed to pair with the Dura-Ace R9250 front and rear derailleurs, as well as the R9200 hydraulic disc brake calipers.