The Shimano SM-RT54 disc brake rotors provide exceptional stopping power in all riding conditions. Shimano&';s Center Lock mounting system makes installing and removing rotors quick and easy thanks to the spine mount and lock ring design.For use with resin pads onlyCenter Lock lockring design offers fast and easy installation SPECS table{border-collapse:collapse;width:100%;} td{text-align:left;padding:8px;font-weight:350;} tr:nth-child(even){background-color:#f2f2f2} th{background-color:#eb212e;color:white;text-align:left;padding:8px;} .desc .specs-heading{font-size:24px;font-weight:600;padding-top:35px;border-top:3px solid #f0f0f0;display:inline-block;border-bottom:4px solid #eb212e;width:142px;margin:0;} Rotor Size (mm) 180 Rotor Type Two Piece Pad Compatibility Resin Pads Only Hub/Disc Compatibility Center-Lock