All - googled and found this post - thank goodness. looking to get a 2022 ST but did bot want to run the 275/45/21 setup in the winter. have always owned 2 sets of wheels/tires and swap out for fall/winter vs spring/summer, but could not find out if 20 inch rims would fit over the Street Package calipers until now. TireRack or DiscountTire sells 20 inch rims that fit the explorer w/o adapter plates (match OEM 20 inch offsets) there are also several site that let you compare tire sizes, wheel diameters and offsets. 275/45/21 is virtually identical to OEM 255/55/20. need to double check rim width and offsets, but if you find OEM 20 inch specs, you can find aftermarket rims to fit. Yes it hurts to make that initial purchase but long term, your tires last twice as long when you only run them 6 months a year! once the chip shortage clears up will be placing my order. lucky for me I have a buddy who owns a Ford dealer so can spec the car exactly how i want it and pay whatever his cost is - plus a nice steak dinner w/drinks. he lives in NJ and i live in CO so a one way ticket and a 2000 road trip to break her in!! Cheers all - registered to the ST forum!!!