I have the LTZ spindles, hubs, YFZ dual piston calipers with 4+1 wheels but with MetalTech +2 arms and the width measured outside tire to tire is 54", not sure if spindles added to that width. I used the spindles to improve the geometry and less weight, hubs for 144mm bolt circle for better wheel selection and less rotating mass, and the Back 4"+1" to reduce scrub radius and wanted the front track wider than the 52" rear width, for the dunes only anyways. Lee