Finally have all my loose bits organized and in one place (or heading that way) it's been a lonnnnnnnnnnnnnnnnnnnnnnnnnnnnnng haul.

Among the items - what appears to be at least five different sizes of MPC hollow tires, and some appearing to have been retooled at some point with similar or matching size, but some minor differences.

Some of the size differences are fairly obvious, but others are more subtle, and it does not appear that the sidewall markings are always a tell.

Hoping the usual suspects can shed some light here... thanks!