New to Mazda and new to this forum. I own a 2016.5 CX5 GT and a 2016 Mazda 6 Touring. I found a set of original 17" CX5 rims with snow tires for $400. Its a great deal and they are in great condition with only about 6000 miles on the, I'd like to buy them for my CX5, but also wondered if they will fit on the Mazda 6. Both cars currently have the 19" wheels. Thanks for your feedback.

 

The tire diameter on your CX-5 with 19" rims is 28.7" while the diameter of the Mazda 6 tires with 19s is 27". Assuming the 17s with snow tires have the correct size tires for a CX-5, that diameter is 28.5". So no, you cannot use them on the 6 as the 1.5"-1.7" difference would throw everything in the drivetrain off.