The Shimano Ultegra ST-R8150 Di2 STI Mechanical Brake Lever proves that with Di2 technology, shifting is easy and precise. Just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantly select the correct gear.Shimano Ultegra ST-R8150 Di2 STI Mechanical Brake Lever FeaturesFull and semi synchronized shifting programable, Synchro shift compatible meaning a single shifter can control both front and rear shifting which can be fully custom tuned to your riding preferences. Semi synchronized shifting means when a front shift is made the rear mech will automatically correct to the appropriate ratioSimply pressing tactile buttons allows effortless and comfortable shifting even when your hands are coldDrop bar STI with shift buttons located in a near identical place to the positions you'd assume shifting using a mechanical Shimano STIServo Wave brake lever pivot is positioned to be used with super SLR brake callipers, increase power providing excellent ergonomics when riding on the hoodsFinely tuneable reach adjusters for the levers enable custom fitment for all handsWired connection to the front and rear derailleurs with SD300 series wiresComes complete with an SLR brake cable set