This 1955-57 Chevy Belair, Impala, Biscayne disc brake conversion kit is great for small rim and tire combos. These kits are everything you need to convert to power disc brakes on your 1955-57 Classic Chevy. Mounts to your original spindle using 11″ GM rotors making installation a snap! .375″ thick one piece caliper brackets offer a clean and strongcaliper mount exceeding any GM specifications. Works with most 13″ outset Dayton and aftermarket 14″ wheels designed for disc brakes. 15″ wheels recommended.