EBC Brakes chrome rotor for big twins is a polished stainless and chrome centre hub finish range of fully floating brake discs/rotors for all US built big twins and cruisers. As with all EBC big twin rotors, all components and hardware are stainless steel but in addition to the high lustre polished stainless steel centre hub, we have applied a chrome finish to improve the cosmetics. The outer rotor ring or blade is from heat treated and tempered stainless steel with a diamond ground finish mounted onto the centre hub with EBC’s patented SD system square drive rivet hardware. The SD system buttons which appear circular are flat sided and mount into square pockets in the centre hub and rotor blade allowing the rotor blade to expand and contract freely under heavy braking, totally eliminating brake vibration and rotor distortion. Most big twins are built these days with cost saving solid front and rear brake rotors but the new EBC Brakes chrome rotor for big twin units convert this old technology to a modern fully floating design that will reduce the chance of rotor warping and vibration. Front designs are 5 button to reduce weight but rear units are a beefy 10 or 12 button design for much heavier abuse and braking.The EBC units fit directly onto your motorcycle in place of the standard OEM units and require no modification or extra hardware and install is a breeze. Remember to never use worn or old brake pads on new rotors which can cause hot spots and damage your new rotors. Allow 300-400 miles careful brake use unless in an emergency after fitting new rotors and pads.