[chadwick]

Just like folks said… hit a pothole on I-45 south of Dallas at 70 and destroyed the sidewall. I even only got the 19” wheels thinking I’d have a bit more rubber. Hah.

BMW roadside was incredibly useless, too. I can’t believe how poor the quality was since I last used them (decade ago). I gave up and called a local tire place instead since we are on a long road trip.

[eliphil]

I have 20 run flats on my m550 feel like it’s a ticking bomb. I’m considering a full size wheel and tire spare for road trips tired of taking the wife’s truck. The roads in north east stink

[BlueSander]

Happened to me once as well. What tires were on your car?

[smacky]

That sucks to see. Once these factory Cinturatos take a shit, I'm getting the PS4 ASs.

[chadwick]

I have the Goodyear F1s, 245/70R19 up front.

[Chappers 71]

Is best to avoid pot holes

What tyre (tire) pressures you running?

[NGT2]

Originally Posted by smacky

That sucks to see. Once these factory Cinturatos take a shit, I'm getting the PS4 ASs.

You have 19’s or 20’s?

[HerkHealer]

Originally Posted by eliphil

I have 20 run flats on my m550 feel like it’s a ticking bomb. I’m considering a full size wheel and tire spare for road trips tired of taking the wife’s truck. The roads in north east stink

Get rid of those nasty things, get a space saver spare for the trunk, and put a new set of PS4S tires on.
It will blow your mind on the handling, noise and comfort difference.

[smacky]

Originally Posted by NGT2

You have 19’s or 20’s?

I have the 19s. I forget the wheel style number but whatever the LCI 19" are from factory.

[csctiscalia]

I feel the pain. Found a meteorite crater the other night and my Pirelli run flat came out like this. Surprisingly, it held air, allowing me to limp home. The 20” 668m wheel came away less than round, unfortunately.

[BWilson263]

Originally Posted by HerkHealer

Get rid of those nasty things, get a space saver spare for the trunk, and put a new set of PS4S tires on.
It will blow your mind on the handling, noise and comfort difference.

2nd that advise. I got rid of my runflats soon after i got my 540 with 19 inch Continentals ExtremeContact DWS06 tires.

[NGT2]

Originally Posted by smacky

I have the 19s. I forget the wheel style number but whatever the LCI 19" are from factory.

You getting the PS4 AS runflats or non runflats? I have 19’s. Pre LCI but size is the same. I want to get the PS4 AS tires and will need tires soon. I think the make a runflat for the Corvette but it’s a different size. I guess I’ll probably just get a modern spare kit and get the non runflats.

[Joe-BMW33]

Originally Posted by HerkHealer

Get rid of those nasty things, get a space saver spare for the trunk, and put a new set of PS4S tires on.
It will blow your mind on the handling, noise and comfort difference.

eliphil

Mark - Mike (eliphil) was asking me about spare options. I know you got a good kit. Which one was it and is there a max mileage you can drive on the spare?

[HerkHealer]

Originally Posted by Joe-BMW33

eliphil

Mark - Mike (eliphil) was asking me about spare options. I know you got a good kit. Which one was it and is there a max mileage you can drive on the spare?

Joe /mike, this is the kit I went with. Modern Spare.
Everything comes in a bag and it fits perfect in the trunk using the tie downs.
Not sure on miles, but i'd imagine quite a lot. I think I bought mine on sale for around $425 that included the jack, spacer......everything.

https://modernspare.com/product/2017...e-kit-options/

[chadwick]

I was running the normal 35 front / 38 rear pressure that day. I think the fronts were at 32 when I left when they were cold so a bit low.

[Neusser]

Originally Posted by chadwick

I was running the normal 35 front / 38 rear pressure that day. I think the fronts were at 32 when I left when they were cold so a bit low.

Front pressure is near optimal for the Goodyear. Pothole at 70 is going to be a problem for just about any low-profile tire.

[NGT2]

Originally Posted by HerkHealer

Joe /mike, this is the kit I went with. Modern Spare.
Everything comes in a bag and it fits perfect in the trunk using the tie downs.
Not sure on miles, but i'd imagine quite a lot. I think I bought mine on sale for around $425 that included the jack, spacer......everything.

https://modernspare.com/product/2017...e-kit-options/

If you have to use this spare, is it safe for the car? I have heard the AWD system on these cars is very finicky with different tire sizes. Does the tire width/weight not matter?

I’ve got to get new tires soon and I really want to get the PS4 AS tires but they only come in non runflat for 245/40/19.

They make a runflat for 19’s for the Corvette but it’s 275/35/19. I’ve never seen anyone talk about running a square setup with that size, only using it for rears on a staggered setup.

[BlueSander]

Originally Posted by NGT2

If you have to use this spare, is it safe for the car? I have heard the AWD system on these cars is very finicky with different tire sizes. Does the tire width/weight not matter?

I’ve got to get new tires soon and I really want to get the PS4 AS tires but they only come in non runflat for 245/40/19.

They make a runflat for 19’s for the Corvette but it’s 275/35/19. I’ve never seen anyone talk about running a square setup with that size, only using it for rears on a staggered setup.

As long as the diameter is within/around 1%, you are fine.

The 20" staggered setup that these M550i come with, the diameters on those 245/35 front and 275/30 are different as well.

Use tire size calculator and do quick comparison before making the purchase.

[BWilson263]

Originally Posted by HerkHealer

Joe /mike, this is the kit I went with. Modern Spare.
Everything comes in a bag and it fits perfect in the trunk using the tie downs.
Not sure on miles, but i'd imagine quite a lot. I think I bought mine on sale for around $425 that included the jack, spacer......everything.

https://modernspare.com/product/2017...e-kit-options/

Looks like the perfect setup for my ride. I will be buying this very soon. Thanks for the information.

[smacky]

Originally Posted by NGT2

You getting the PS4 AS runflats or non runflats? I have 19’s. Pre LCI but size is the same. I want to get the PS4 AS tires and will need tires soon. I think the make a runflat for the Corvette but it’s a different size. I guess I’ll probably just get a modern spare kit and get the non runflats.

I would get non-RFTs from now on. I've only had them on my card if they came with them. They just provide trash rides and really no benefit for the times me or my family experienced a blowout. Not worth it, for me.

[TEF]

I've owned three BMWs with run flat tires, but I am not sure that it's the tires that bear all the blame. To keep up with fashion trends, the manufacturers must offer larger and larger wheel/tire combinations and that result in taller rims and shorter tire sidewalls. Considering its a run-flat's stiff sidewalls that support the vehicle in the event of a puncture, the engineering of these tires is quite difficult. The stiff sidewalls result in a very heavy tire carcass, that works against it (in the form of inertia) when hitting a pothole. Wheels are more often damaged too. Hence BMW dealers flogging wheel and tire insurance at the time of purchase.

While I personally hate runflat tires, conventional tires, no matter the manufacture, mounted on 19 and 20-inch wheels will fare no better with potholes. The laws of physics will still apply. Just go back to 17" wheels and these issues will largely go away.

[Neusser]

Originally Posted by TEF

I've owned three BMWs with run flat tires, but I am not sure that it's the tires that bear all the blame. To keep up with fashion trends, the manufacturers must offer larger and larger wheel/tire combinations and that result in taller rims and shorter tire sidewalls. Considering its a run-flat's stiff sidewalls that support the vehicle in the event of a puncture, the engineering of these tires is quite difficult. The stiff sidewalls result in a very heavy tire carcass, that works against it (in the form of inertia) when hitting a pothole. Wheels are more often damaged too. Hence BMW dealers flogging wheel and tire insurance at the time of purchase.

While I personally hate runflat tires, conventional tires, no matter the manufacture, mounted on 19 and 20-inch wheels will fare no better with potholes. The laws of physics will still apply. Just go back to 17" wheels and these issues will largely go away.

Indeed. Common sense.

If you hit a pothole at speed with a low-profile tire, you are done for (usually). Runflat makes no difference.

Last pothole I hit was 15 years ago when I lived in DC, and it destroyed my Pilot Sport. Potholes seem not to exist in most of Western Europe, or I have become an exceptional driver.