Is there a specific name for this little part?

Evoke
Evoke Posts: 39
edited August 2009 in Workshop
I have a fixed gear bike with miche hubs. Whilst loosening the rear wheel the track nut fell apart as it had cracked into 2 parts. (the bit with the serrations). But then the little black nut on the inside of the hub fell of in 2 pieces also.miche_pista_hubs.jpg

Is there a name for that little black nut part? Can i get a replacement or do i need to get a new hub? Thanks.

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