Bike porn

although this is strictly not bike porn, but it's an adaptor that allowed a geared hubs to be converted as a fixed wheel hubs;
fantastic news bringing us an even larger choice of hubs to be used as fixed, as well as reusing old wheelset without needing to change the hubs. I feel it's good news for those who play polo and usually tend to keep a budget as well as needing a smaller cog to cycle home to.

Sounds good.

I don't understand (yet) what is preventing the adaptor from unscrewing itself from the hub, or said differently, what works as a the usual lockring?

Loic