. Long regarded as the most notable feature of Shimano Di 2 shifting, the front derailleur performance remains the best in the industry, now with the additional capabilities of Shimano Synchronized Shift With XTR M9070 Di 2, front shifts require the same light effort of a rear Di 2 shift, reducing effort & freeing up the rider to focus on the trail. The FD-M9070 uses computer controlled auto trim as the chain moves up & down the cassette to keep the drivetrain running smoothly. Shimano Synchronized Shift compatibility allows a single shifter to control both front & rear shifting. Specifications: More powerful shifting than mechanical (+25% compared to M9000) Reliable gear changes under load Computer controlled auto trim Optimized Di 2 cage profile & gear tracking Shimano Synchronized Shift compatible System communication with rear derailleur Advantage in all conditions Modular mounting structure A 2 year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace & XTR products) Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.