Just realised my rear disk is loose on the hub.
It’s an Avid disk on DT Swiss hub, but not a fitting I’ve come across before – what do I need to tighten it up?

Cheers.

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Hollowtech 2 Bottom bracket spanner/socket.

BB tool for one and Cassette tool for the other, that one looks like the BB tool

Cheers Guys, BB tool it must be.
Much bigger than my normal lock ring tool.

Yup. BB tool. I bought a couple for my Cannondales that have 6 bolt at the front and centrelock at the back. Brilliant bits of kit.

The lockring maybe tight and they can rock on the splines. A little dab on the splines with threadlock helps to stop it. Use a spanner BB tool rather than a socket. Its quite a narrow nut and the sockets have a chamfer on it and will only grab half the lockring.