Upgrade from your stock factory rotors and greatly increase your stopping power substantially. You not only get better stopping power, but you also increase your safety when it counts the most.; Left rotor kit Provide 30% minimum more stopping power than factory-sized rotors Includes oversized floating stainless-steel rotor and billet brake caliper adapter and necessary hardware 15" kits are designed for Dyna, Softail and XL models with 19" or larger front wheels Utilizes factory brake caliper, rotor hardware and brake hose Easy bolt-on installation, no need to re-bleed the brake system Will not work with Arlen Ness Hot Legs fork legs