[OttawaSteve]

??? All of the available tires are the same diameter and therefore height; they have to be or the speedometer and the stability systems won’t work properly. The difference is the tire sidewall height and the wheel diameter. The bigger the wheels the shorter the tire sidewall.

The tire/wheel combos will all fill the wheel well the same. If you want less gap above the tire, you need to do it with suspension.

 

[OttawaSteve]

You can get the approved tires (including brand and exact size) from Porsche (summer tires attached). The sidewall height is expressed as a percentage of the tire width (the 40 means 40% of the width), so the number will change with different width tires.