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Flow Mountain Bike are conducting a long-term test on the new Shimano XTR Di2 drivetrain, which we've fitted to a Pivot Mach 4 Carbon. Here we take a look at the various shift modes offered by the system. You can read all about the installation process on Flow - http://flowmountainbike.com/tests/shimano-xtr-di2-long-term-test-installation/