hi~~

I have a Miyata 610, and I converted it to fixed gear before the winter. A few days ago, I became bored of fixed gear and its limitations (TREACHERY, I know) and regeared it, upgrading many of the parts in the process. Reattaching the components took no longer than removing them, and everything is working fine.

So, I recommend you convert your Miyata for now. I haven't found any of the modern purpose-built fixed gear frames to ride as nicely as my old Miyata, and if you end up disliking the new setup, it's rather trivial to restore it to the previous condition as long as you don't lose anything.