The Goodyear Efficient Grips on my M Sport with 18" wheels feel pretty soft compared to other run flats I've had on BMW's. My E93 335 had Bridgestones which I just replaced with Michelin Pilot Sport run flats which are pretty nice. Dealer said they were looking for alternatives to the Bridgestones because of o many complaints and wanted my opinions on the Pilot Sports RFTs. There not as nice as non run flat Pilot Spprts but still pretty nice ride and better handling than the Bridgestones or Goodyears. The Goodyears seem the softest and thet are all summer performance.
1995 325i,1996 328ci,1997 528i,1997 Z3 2.8,
2001 X5 3.0,2001 330i Conv,2002 M3 Conv,
2003 M3 Coupe,2004 M3 Coupe,2004 Z4 3.0,
2004 X3 3.0,2007 X3 3.0,2007 335i Conv.,
2013 X1 28 sdrive M Sport