Beefcake Racing and Boostworks share with us some helpful wheel fitment info – namely whether 17″ wheels would clear the 2015 Mustang GT brakes.
As you can see in their photos, that’s an affirmative… as long as we’re talking about the standard GT brakes and not the upgraded performance package Brembo brakes (which require at least 18″ wheels).
More specific fitment details inside.