New to this forum but need help with wheel sizes

[Christang.GT]

So I'm new to this forum or any forum really. I have 2015 GT pp premium, I lowered it an inch all around with steeda lowering springs and koni shocks. I want to get wheels next but I am wondering if I can do a 20 in the back and a 19 in the front with say 305/30/20 in the back and a 275/35/19. does anyone have those sizes on right now? is there any rubbing or would there be any issues? PLEASE HALP!!!
btw heres my car

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[tokuzumi]

Rubbing will depend on offset of the wheels. You'll most likely need to roll the inner rear fender to prevent the fender from contacting the tire. Talk with a tire shop or one of the vendors who sells parts here.

 

[SheepDog]

Both of those sizes will fit no problem, provided you have the right wheels.

 

[shogun32]

I am wondering if I can do a 20 in the back and a 19 in the front with say 305/30/20 in the back and a 275/35/19.

MRR M600 come in 10 and 11 and are native to Mustang dimensions.
https://www.mrrwheels.com/collections/wheels/products/m600

Those tires will fit just fine on the 10et35 and 11et50. I'm not sure I would do the 19/20 mix but there's no harm in doing so.

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