I'm still trying to gather more information as to what rims fit the 2020 ST with the performance brakes. I was just at Ford and they have a fitment guide showing the ST needs to use the 20" LC5Z 1007 DWSP rim with 255/55R20. I can't even find a picture that shows what that rim looks like and the price is crazy, just under $400 CAD ea. Finding rubber that size is not easy either, all said an done a set of those rims with Michelin Alpine LA2's is going to run around $3,000 out the door.
Has anyone tried to fit an 18" rim yet? The dealer is going to get in the 18" Steel 'LB5Z 1015 B' to see if it will fit. I'll save around $1,000 if I can get 18's instead of the 20's listed above.
For those wondering, the Ford spec sheet also shows the hub size is 70.5. After market rims I have been looking at listed it as being 67.10.