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Using the compact spare with a GT that has 20" Foundry wheels?

GTDRPTP

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Location
Snohomish WA.
First Name
Wayne
Vehicle(s)
2017 GT Convertible Premium
So I am confused, I searched and found some info but nothing definitive or that explains what I am trying to find out.

Is it safe to use the 18" compact spare? Will doing so cause any problems or damage?

Looks like the 265/35R20 tires have a diameter of 27.3" and the 155/60R18 has a diameter of 25.3".

It is the appropriate spare for the standard 18" wheels and 235/50R18 tires, those are a 27.2" diameter, so just a touch smaller than the 20" tires.

I have a non PP GT, so brake clearance should not be an issue. Makes sense to me not to use on the rear drive wheel due to size difference.

Would there be any cause for concern using it on the front with 20" Foundry wheels everywhere else?
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