Shimano 105 R7170 Di2 12 Speed Shift/Disc Brake Set – Rear 105 R7100 / R7150 – It's A New Day For the 40th anniversary since its launch in 1982, the 105 series gets its ultimate upgrade with Shimano's electronic Di2 shifting technology. Maintaining the series-typical price level, the precise shifting function, precisely tuned ratios and a reliable braking system thus become accessible to an even wider circle of road cyclists. Because in the tradition of its predecessors, the current 105 is also equipped with the top technologies – such as the wireless cockpit – and first-class features from the state-of-the-art Dura Ace and Ultegra series to enable their riders to discover the road anew, every single day. Shimano 105 Di2 RD-R7170 STI brake/shift lever As with the current STI levers of the