The TeraFlex JK Front Big Brake Kit is designed as a factory brake upgrade for JK owners looking for a performance brake package that will handle the increased braking requirements needed after larger wheels and tires are used. The simple bolt-on upgrade installation requires no cutting, welding or adapter bracketry. The big brake kit features oversized 56mm dual piston calipers for increased clamping force and surface area. The 13.3? Mill-balanced vented rotor provides greater braking leverage to allow stopping distance to be decreased substantially and decreases heat buildup. The rotors also feature two wheel bolt patterns - 5x5" and 5x5.5". The Composite-resin, semi-metallic pads have excellent cold stopping power resulting in maximum initial speed scrub, increase pad life and reduce noise & dust. Note: A minimum of 17? diameter wheels must be run with the big brake kit.