OK, I’ve not seen this one before. Judging by the roll cage and shaved tires, this person clearly uses their Miata for actual autocrossing events.
So I’m guessing the hitch mounted spare tire serves one (or more) of the following purposes:
- Free up space in the trunk that would otherwise be consumed by the spare. (Can you even get a full-sized spare in the trunk of a first-gen Miata?)
- Allow the spare to quickly be removed to reduce weight before racing
- Cool retro “Contintal Kit” look.
Honestly, if it is for any reason other than #3 above, I’d probably just ditch the spare altogether and use a can of fix-a-flat. What do you think?