The BOX Two 9 Speed E-Bike Twin Lever Shifter is designed specifically for the Box Two e-Bike drivetrain. With improved ergonomics the comfortable thumb & index finger the shifter provides smooth and accurate transitions from gear to gear. The shifter is restricted to one gear per shift which improves e-bike drivetrain durability. Standard handlebar clamp mount of 22.2mm. A shifter cable is included in the box.