Hey guys, I'm totally ok with the RTFM / search the threads response. I've actually been doing that as well, but I thought I might as well introduce myself and see if anyone had anything specific or obvious I might have missed.

I found this post which explained a bit about the Jing A and Jing B plates, as well as a bit about the common bike sizes. I'm still a bit confused by that thread, are bikes larger than 250cc completely illegal in China, or do they fall into a different category?

Anyway, thanks again, I'll keep searching the forums.