I carry a small scissors jack with an adapter that fits my frame.
I had Phil at PSE make up a custom narrow (5" wide) knock-off wheel for me. I started with a small tire (195/60X15"), but it took up most of my trunk.
I ended up putting a "collapsible" spare tire on the knock-off rim.
As you can see, I got a LOT of room back with the mini spare.
Hopefully, I will never have to use the inflator, as the prices for full ones at swap meets have gone crazy.
regards,
Jeff