Box Three BMX Disc Brake Caliper - Post Mount 1-3/8" and they save an ounce

and they save an ounce per wheel without any real loss in strength

The VVS Sprocket is a mixture of CNC and stamp forging that takes advantage of both processes to create a sick new addition to the Shadow sprocket line

Wall: Double

and a 19mm adapter is included

These are very basic

Box Three BMX Disc Brake Caliper - Post Mount 1-3/8" and they save an ounceThe Box Three BMX Disc Brake Caliper is here! With a post style mounting interface made of cold forged & CNC machined carbon steel, this disc brake caliper is all you need to improve control. Weighing only 130 grams, this lightweight gadget will spring you smoothly through every turn. All you need to do is focus on the finish line. Compatible will all size rotors (not included). Brake Use: Front or Rear Brake Lever Actuation: Mechanical Cable Brake