You can adjust the lever reach via Allen key

this will become your favourite tool

If you have a BB30 crankset (30mm diameter Aluminum Spindle) the measurement in the spindle picture will determine whether it is a long or short spindle

For RockShox Monarch

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Shimano XT RD-M8000 11 Speed Rear Derailleur - Rear Derraileur - 11 Speed - Black eBay You can adjust the leverThe long awaited Shimano XT 11 speed drivetrain has made its grand entrance, and here is the rear derailleur in the group. The Shadow Plus rear derailleurs are designed to minimise shifting effort, with external adjustability and increased clutch tension range. They have also been designed with a very low profile, to help you clear hazards on the trail. Featuring Shimano's innovative Shadow RD + technology and a refined geometry, the Deore XT M8000 11