Shimano GRX SM-RT64-S Disc Brake Rotor with External Lockring - 160mm, Center Lock, Silver Shifter Parts (Electronic) UPC: 696260081004

UPC: 696260081004

It goes underneath the conical spacer unless you are taking that off and are slamming that stem

Manufacturer Part Number: PL589BKH

MA1028 TR1982 592643

- Prepares surface

Shimano GRX SM-RT64-S Disc Brake Rotor with External Lockring - 160mm, Center Lock, Silver Shifter Parts (Electronic) UPC: 696260081004The Shimano GRX SM RT64 disc rotor delivers powerful and consistent braking performance in all riding conditions. The Center Lock mounting system makes installing and removing rotors quick and easy, thanks to the spine mount and lock ring design. Compatible with both resin or metal pads Includes external type rotor lockring Product Specifics Rotor Size (mm): 160 Hub Disc Compatibility: Center Lock Disc Pad Compatibility: All Pad Compounds Rotor Type: