That bike has most likely seen some velodrome use and a lot of track racers don't use a lockring because it's not 100% necessary (nobody is busting whip skids on the track).

Italian-threaded lockrings aren't exactly hard to find.

Wow. Gorgeous bike.

I like 70-ish gear inches for the street (42x16, which is easy enough to do). I'll repeat that you can never stop pedaling, but nothing I or anyone else says will impart that lesson as effectively as the jolt you'll get when you inevitably forget.

Thanks caloso. I'm leaving the 50 on the front but in the box are a 17t and 19t to go with the 15t it came with. Really want to get it out on the street. The S.O. still doesn't know about it, it was delivered while she was out. Result!

If you send something nifty in return I'll send you my Phil lockring I'm not using.