Promax mechanical disc brake caliper with adapter Promax 160mm stainless steel rotor with 15mm trike axle adapter All components necessary for upgrade are included Includes zip ties, axle keys, new grips and other small parts Fits only new 2016 Sun Traditional 24` Trikes with new derailleur tab and brake mount on rear unit Mechanical Disc Promax Disc Brake Trike Kit Fits 2016 and up Sun Traditional Trike