[omgmike]

About to order a set of PS4s BMW Stars... do they come in run flat? If so, has anyone had a bad experience with them vs. non-run flats?

[Justao]

M does not come with RF

[omgmike]

ah, never mind, I see the run flats aren't available for the M5 with CCBs

[Alberta]

Run flat tires are to stiff for high performance cars.

[shawnhayes]

Originally Posted by Alberta

Run flat tires are to stiff for high performance cars.

Ummm, this is not correct.

If the suspension was designed for it, they are just fine. They become part of the spring rate.

That being said, if there are any questions, put yourself in a time machine and go back to 2009 and ask a 911 Turbo driver that had just had his butt handed to him by a GT-R, either on the dragstrip OR on a road course if run flats were too stiff. They probably were, as the little flecks of them were smacking into his front windshield.

Shawn

[pbonsalb]

RF are much heavier, which can negatively affect handling. There is probably a reason BMW does not put them on the M5. BMW has put RF on other cars.

[shawnhayes]

Originally Posted by pbonsalb

RF are much heavier, which can negatively affect handling. There is probably a reason BMW does not put them on the M5. BMW has put RF on other cars.

It's the suspension calculations. Needed spring rate is generally one of them, and if you make it too stiff on an M5 the ride is harsh.

Suspensions and high performance are one of the physical "magic" of the world left. Two f1 drivers with million dollar suspension budgets have different settings at the same track. BMW has to choose the "best" suspension for the masses. For my crazy nuts on track antics, to grandma who uses it as a grocery getter over pothole ridden streets. It varies car to car.

Shawn

[damianwo]

I purchased a set of RFT 285s all around from Walmart at $160 each shipped, Bridgestones with original price of $590 each. Not only the tires were 4 years old but they ride terrible, feels almost like a carriage suspension. Never again. Ordered Michelins instead.

[omgmike]

I ended up with Pilot Sport 4S BMW Star and OMFG I can actually feel a night and day difference in the quality of the tires over the P Zeros that came with car from the factory.

All in just a tick under $2300 at Discount Tire, including tire certificates. Well worth the cost, IMO, for anyone needing new tires.

[ResIpsaLoquitur]

Originally Posted by omgmike

I ended up with Pilot Sport 4S BMW Star and OMFG I can actually feel a night and day difference in the quality of the tires over the P Zeros that came with car from the factory.

All in just a tick under $2300 at Discount Tire, including tire certificates. Well worth the cost, IMO, for anyone needing new tires.

Congrats and great move. You’re going to love them!

You can now see why we refer to PS4S factory equipped cars as winning the tire lottery.

[omgmike]

Originally Posted by ResIpsaLoquitur

Congrats and great move. You’re going to love them!

You can now see why we refer to PS4S factory equipped cars as winning the tire lottery.

I've always known Michelins are the best. I've run them on all of my cars, except for my old F150 -- Supra Turbo, Mustang GT, 4Runner, now my M5C, and all my old bikes (CBR 600F4i, CBR 600RR, CBR 1000RR) -- and I put them on all my wife's SUVs, too.

This is more like a homecoming for me. I'm just shocked at how big of a difference there is in the feel between the Pirellis and the Michelins. It's shocking, quite honestly.

[ResIpsaLoquitur]

Originally Posted by omgmike

I've always known Michelins are the best. I've run them on all of my cars, except for my old F150 — Supra Turbo, Mustang GT, 4Runner, now my M5C, and all my old bikes (CBR 600F4i, CBR 600RR, CBR 1000RR) — and I put them on all my wife's SUVs, too.

This is more like a homecoming for me. I'm just shocked at how big of a difference there is in the feel between the Pirellis and the Michelins. It's shocking, quite honestly.

I’m glad you’ll get to extend that experience to your M5.

Welcome back.

My pre-LCI had Pirellis and my LCI came with Michelins. I too could feel an extreme night and day difference. I’ll never use anything else after having the PS4Ss.