Where to buy a spare tire?

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2015 Mazda3
The spare tire that came with the car is about 10 years old now. Its wheel is rusted. I've read that most tires have to be replaced every 6 years or so even if not in use? This spare tire had only been used a few times when I've had a flat. Is this a dealership only item?
 
look on ebay

the tire sitting inside the car should never be exposed to sunlight, so in theory it should last "forever"... UV is what damages the rubber and is why tires gets dry rotted and need to be replaced

the only time you need to replace a spare tire is when it's visbly damaged... happened to our corolla's... the tread started separating from the rest of the tire... apparently common on those cars but never seen it happen before
 
I found a single rim with brand new tire off a 2007 Lexus ES350 with similar wheel specs as the original wheel and tire on my Mazda 6 as a spare. It's heavy, but far better than using one of those crappy donuts.
 
I'd assume only a donut size spare tire would fit in the spare tire compartment in the trunk...
Yes, you are correct. It fits, but the carpet trunk liner thing just won't sit flush with the floor of the trunk.
 
Yes, you are correct. It fits, but the carpet trunk liner thing just won't sit flush with the floor of the trunk.
I just keep my regular donut in the trunk, but on longer trips where I have space, I may take my full sized spare with me.

If you can find a spare wheel and tire that are the exact same dimensions and size as the OE set on your car, it's an attractive option to be able to just put it on and not worry about it.
 

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