Sun Race M30 7-speed twist shifter Sun Race M40 7-speed direct-mount derailleur Sun Race M3 7-speed freewheel (13-15-17-19-21-24-28T) with 15mm trike axle adapter 36T x 1/2` x 3/32` chainring K.M.C. Z51 1/2` x 3/32` chain Promax DSK-300 mechanical disc brake and mounting hardware Promax 160mm stainless steel rotor with 15mm trike axle adapter Promax BL-46K 4-finger brake lever with parking lock High density black foam Grips, 92mm left side / 130mm right side Kit includes all parts needed for complete installation Kit only compatible with 2016 or newer Sun trikes with rear derailleur and disc brake mount on rear unit Mechanical Disc 7 Speed Sunrace / Promax Disc Brake Trike Kit