Does anyone know if the new style Rockshox air Top Cap assemblies (the ones that take the cassette lock ring tool) are compatible with 2017 Lyriks? – same threads etc?

I’ve lost the Schrader dust cover and it doesn’t look as though they are available to buy separately. If I can upgrade to the latest version then psychologically it would make me feel better about buying a complete assembly I don’t need.

I think so, they are listed in the parts catalog as compatible with all 2016+ Lyriks.

(part no. 11.4018.083.000, https://www.sram.com/sites/default/files/techdocs/rockshox_spc_reve.pdf)

Or just stick a plastic schraeder valve cover on there – might even save you a gram!

I could do but I am a tart so Iv ordered a new one now. I slightly damaged the spanner flats anyhow by being a spanner. I already swapped to 2019 internals on both the air and damper side so this will finish off the transformation which makes me happy.