Programmable functions including Fox suspension remote duties
Customizable inboard/outboard lever position
Made in Japan
Shimano part # ISWM9050L
Fresh cables and housing feel great, don't they? Like your drivetrain is brand new. As sure as the fizz follows the plop, however, those housings get contaminated and make your drivetrain feel old and worn out a few weeks later. Sealed cables and rubber ferrules are not the solution, electronic shifting is, and the control center is right here in the Shimano Firebolt XTR Di2 9050 Shift Lever.
Yes, making the jump to a Shimano Di2 MTB drivetrain is an expensive way to get out of regularly changing your cables & housing, but there are actually a few more perks to the switch. Among those is Shimano's effort at eliminating the necessity of a front shifter, although not in the way you might expect. Thanks to Shimano's Synchronized Shifting feature, front derailleur shifts can be initiated by the rear shifter. As the limits of the cassette are approached, the onboard computer will choose the best gear combination according to chain line and power output, and if that requires shifting the front derailleur, your robot drivetrain will do that. All you have to do is pedal; no front shifter required. Brilliant. Of course, the option for manual control of the front derailleur still exists, along with the front shifter to function as a remote control for Fox Suspension mode features.
As demonstrated on Shimano's Di2 road groups, electronic-assist enables enhanced ergonomics and less effort at the levers, which 9050 Di2 provides also. Using a push-push design, each shift lever follows the natural arc of your hand, and the circular clamp design allows optimal positioning for every rider's unique physiology.
Remember, Shimano's left/front Di2 9050 shifter is not necessary to successfully run a 2X or 3X drivetrain. Syncro Shift allows front and rear shifting from the rear shifter only; the computer determines when to shift the front derailleur. This feature can be overridden for manual front shifting, which does require the use of a left/front shifter.