Shimano Dura-Ace SM-RT900 Center Lock Brake Rotor Lockring With Washer

If you're running Shimano Dura-Ace RT900 rotors, you might need this little guy.

It's a brand new, genuine Shimano SM-RT900 center lock rotor lockring, and it comes with the washer included.

It's the part that holds your rotor tight onto the hub.

This is for road and racing bikes, compatible with the RT900 disc rotor model.

It's made in Japan, so you know the quality is there.

The MPN is Y8PV98010.

It's new but might not come in the fancy retail box, just the part itself.

If you've lost one or are building up a wheelset, this is the exact OEM piece you need.