Are run-flat tyres worth it, or just a waste of time and money?
Run-flat tyres may sound like a great luxury product but in reality there are disadvantages. Run-flat tyres are special tyres that can still function short-term even with a puncture. They use special supports built into the tyre that can keep the wheel rolling like it should even when the tyre has no air in it at all.
If you drive a BMW that isn’t an M sports car, your car will have RFTs (run-flat tyres) on by default unless they’ve been changed by an owner.