The Mini S uses run flat tires rated at 130mph, depending on brand, $200+ mounted and spun balanced is about the going rate. Ask me I’ve bought a few. The best price I could get after extensive shopping was about $700/4 on the car at Discount Tire.
What I don’t like about my Mini is the dealer’s hourly shop rates are high, factory parts are very high and about nobody else makes parts or works on them.
I beleive Mini is owned by BMW. That is SOP for BMW ... nothing on a BMW can be made to fit on any other car on the planet. That is why I will never own (another) BMW.