Michelin Pilot Sport PS2 tire compared to stock run flats

07335 · 05-21-2008, 01:48 AM

I purchased Michelin Pilot Sport PS2 tires in the same sizes as the stock run flats. I compared the two rear tires together and the PS2's look as if they're 1/2" wider than the stock run flat 255s? The fronts also appear to be wider. Anyone else notice this from going to non run flats?

BuLoOoSki · 05-21-2008, 03:17 AM

hows traction, noise, and drive comfort with those tires? i need to change my RFTs!

Park2670 · 05-21-2008, 07:52 AM

Its not the fact they arent runflats, its just the PS2s. Go to a dealer and see all the cars that have the Zero Pressure PS2s and they all look much bigger. Much better tires however.

jprieur · 05-21-2008, 12:10 PM

What you are seeing is the difference in whats called 'section width'. This is a measurement of the widest portion of the tire. The PS2 have a fairly average section width for the size (10.2" I believe). The stock Bridgestones have a VERY NARROW section width for the size (I think its around 9.6" or so). Even though they are the same Pmetric sizes the Bridgestones are narrower.

Most tires of this size (255/35/18) will have a section width of around 10.2". BMW would have been better off choosing a 9" size for the rear wheels with this size of tire.

05-21-2008, 01:48 AM	#1
07335 Private First Class 19 Rep 125 Posts Drives: SG coupe Join Date: Jun 2007 Location: Alexandria, Va iTrader: (2)	Michelin Pilot Sport PS2 tire compared to stock run flats I purchased Michelin Pilot Sport PS2 tires in the same sizes as the stock run flats. I compared the two rear tires together and the PS2's look as if they're 1/2" wider than the stock run flat 255s? The fronts also appear to be wider. Anyone else notice this from going to non run flats?
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05-21-2008, 03:17 AM	#2
BuLoOoSki Colonel 749 Rep 2,108 Posts Drives: 2015 BMW M3 Join Date: Oct 2007 Location: Kuwait iTrader: (9)	hows traction, noise, and drive comfort with those tires? i need to change my RFTs!
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05-21-2008, 07:52 AM	#3
Park2670 General 355 Rep 18,218 Posts Drives: Tesla Model 3 Join Date: Jan 2006 Location: UTAH iTrader: (8)	Its not the fact they arent runflats, its just the PS2s. Go to a dealer and see all the cars that have the Zero Pressure PS2s and they all look much bigger. Much better tires however. __________________
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05-21-2008, 12:10 PM	#4
jprieur Private First Class 10 Rep 113 Posts Drives: 2007 335i Join Date: May 2007 Location: Virginia Beach, VA iTrader: (1)	What you are seeing is the difference in whats called 'section width'. This is a measurement of the widest portion of the tire. The PS2 have a fairly average section width for the size (10.2" I believe). The stock Bridgestones have a VERY NARROW section width for the size (I think its around 9.6" or so). Even though they are the same Pmetric sizes the Bridgestones are narrower. Most tires of this size (255/35/18) will have a section width of around 10.2". BMW would have been better off choosing a 9" size for the rear wheels with this size of tire.
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