The answer is straightforward: RFT stands for run-flat tire, which, as the name would suggest, is a tire that can continue to run, even when it's flat. In comparison, typical tires will, of course ...

Bridgestone is a leader in run-flat tire technology. Porsche chose the company in the mid-1980s to develop a special run-flat for its 200-mph 959 supercar, and they have been innovating ever since.