The sram gx eagle 12 speed trigger shifter the challenges of riding a mountain bike should be kept to roots rocks mud trees jumps drops and breathing putting total control of your gear selection into the thumb of one hand itrsquos simple to find the right gear right now the gx eagletrade trigger shifter is the control centre of the eagletrade drivetrain its internal works have been updated to include a 12th gear and improved to enhance trigger feel precision and durabilit