Sun Bicycles Disc Brake Trike Conversion Kit Intended for use on the Sun Bicycles 24" Traditional Trike 2016 or newer with updated derailleur tab and brake mount on rear unit Promax mechanical dis brake caliper and 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