Originally Posted by
seypat
Since there are some experts watching, what is the correct tool for the 3 notched lock ring pictured here? I have 2 or 3 bikes that have that headset.
Either the Hozan lock ring tool, one end of which has a smaller radius designed for those rings, or an adjustable hook spanner.
N.B. I've always found those notched headset lockrings to be superfluous. You already have the locknut to hold the adjustment, so why the ring as well? Seems like a "belt *AND* suspenders" approach. You can leave it off and replace it with a simple spacer.