I've looped the chain around a solid railing and can now use the small U-lock to secure the bike. Kryptonite calls this a "disc lock", and while it doesn't fit the PCX brake disc, I can quite easily lock up a spoke, as in the picture.
From my bicycling days I'd feel much more comfortable locking to the frame somehow, but I can't find anything sturdy & exposed. Is there a more secure part of the bike I could lock up to, or is the rear tire about as good as it gets?
P.S.: Excuse the mangy state of the bike. Street parking around here is rather "hazardous" as far as dogs are concerned.
![Sad :(](./images/smilies/icon_e_sad.gif)