microSHIFT ADVENT Trail Trigger Pro E-Bike Right Shifter - 1 x 9-Speed Single-Click Silicone Thumb Pad ADVENT Compatible Only Black. On the trail the goal is to think about your shifting as little as possible. microSHIFTs ADVENT Trail Trigger Pro features millimeter-perfect ergonomics to put the shift levers exactly where you want them giving you quick thumb access without compromising your grip over rough terrain. Light lever action is paired with super positive indexing to make sure you never miss a shift. Theres even an integrated silicon gripter on the lower lever to make sure thumb traction is fully optimized.