Hello everyone. I知 in desperate need of a spare tire for my RX8. Can someone tell me what other cars spares fit on and RX8. I have a 4 year old and I知 scared to take long trips .

 

You mean you're scared that you may get a flat? Or you already have a flat?

Any car with 5x114 wheel bolt pattern will do, so Honda/Acura, Toyota/Lexus, any other Mazda. The only thing to watch out for is that the spare is big enough to fit around the front brakes.
Ideally, you should look for an original but optional RX8 spare wheel package. It takes up a good chunk of the trunk so you may want to take that into consideration.

The flat tire repair kit the car comes with is pretty good, to be honest. If you have a slow leak or a nail in your tire, it will get you under way enough to get to a tire shop.

 

I have an OEM spare wheel. The tire is not included but can be sourced at a tire shop. Let me know if you are interested

 

Loki is correct.
Any compact spare will do as long as the bolt pattern matches and it’s big enough for your car.
I found mine at the salvage yard in the trunk of a Mazda Millenia for $10.