I don't know. Maybe for the 3's series. I had the old X5 with non-RF tires and changed to the new X5 with RF tires. I cannot tell the difference in the ride. In fact I didn't even know they were RF until I got a nail in one of the tires.BMW no longer provides spare tires so they decided to equip as part of OEM RFT's in every new car they sell; which in turn safes weight and improves on CAFE. BTW RT's makes the BMW ride like a concrete truck.