I did just this saved $2KIncorrect diameter tires turn at different speeds. For a Rubi that is staying in 2wd to get from the side of the road to a tire shop, it could work. Not ideal by any means and I specify a Rubi because it doesn’t have a limited slip but is open until the locker is engaged. For someone that has a limited slip if you had a flat on the rear, you could put a front matching tire on the rear and the spare on the front. This creates a significant amount of additional work but would work.
Easiest is to have matching tires.
I have a 2 door Rubicon and went with Mopar Bead Locks (Not Mounted as Bead Locks) and 35" Cooper ST Pros
I put a tire cover on my 33" Spare and figure I saved $2000.00 by not buying the wheel, tire and Tailgate Reinforcement.I read on other forms guys doing this as well.
I'll limp to the tire store