The climb can be incredibly difficult but if you have to contend with slow gear changes and also with gravity, friction and fatigue? Forget it. Nevertheless Shimano's Di2 SW-R600 Remote Climbing Shifter allows you to shift electronically with ease thanks to its design which is attached to the steering wheel using zippers ​​providing easy access when you start your favorite (or most hated) climbs. With this unique setup you will be able to change gears without putting your hand near the hood, which can be slow, sketchy and awkward and you can count on the deadly precision of the electronic transmission. The cable is hardwired to the remote control for easy installation , and the SW-R600 is compatible with Dura-Ace 9070, Ultegra 6770 and Ultegra 6870 group sets.