Can I downsize the wheels on my 2015 Mazda3 S?

I want to change them from a 18 wheel to a 16 inch wheel, can this be done?
Absolutely, the OEM size:

Tire Size 205/60R16Wheel Size 6.5Jx16 ET50

I recommend sticking to this.
 
Hi there, I remember that this is the OEM wheel size for the 2L . Since you have the 2.5, you'd need a slightly wider wheel and tire.

Try something like:

Wheel: 7x16 et 45
Tire: 215/55-r16
 
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