G30 Poll: Run-Flats vs NonRun-Flats - Page 3 - Bimmerfest - BMW Forums



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G30 (2017 - Current)
The next generation 5 Series, chassis code G30, arrives at dealers in February 2017. Looking like a scaled down 7 Series and riding on the CLAR platform, the new 5 Series will have a focus on lightweight and sporty performance. Engines options will come from BMW's new B family for the 530 and 540 and a turbocharged V8 for the M550i. Read more about the 2017 5 Series

View Poll Results: What is your choice & current opinion regarding run-flats?
Have run-flats and regret getting them 9 16.36%
Have run-flats and do not regret getting them 26 47.27%
Have non run-flats and should have gone with run flats 1 1.82%
Have non run-flats and love them; no regrets 19 34.55%
Voters: 55. You may not vote on this poll

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  #51  
Old 10-04-2017, 01:25 PM
Autoputzer Autoputzer is offline
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Originally Posted by BMWfandude View Post
Wow. I expected better than 50/50 on this poll.
Better which way?

When it's that evenly divided, a manufacturer has to be able to go both ways or alienate a lot of customers or potential customers.

I wish you could order tires a la carte on a new BMW: RFT or non-RFT, staggered or square set-up, wheel diameter, all-season or summer, touring or high-performance.
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  #52  
Old 10-04-2017, 03:43 PM
BMWfandude BMWfandude is offline
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Originally Posted by Autoputzer View Post
Better which way?
I've heard/read nothing but negative comments about run flats and expected it to be at least 75% for NRF.
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  #53  
Old 10-04-2017, 06:02 PM
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Gary J Gary J is offline
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Gary, that surprises me. Driving up or down I95 from the moment you cross the border into SC it is like you hit a dirt road. Nice Porsche.
Thanks.

Roadwork going on all over SC. It started with Super Guv Nikki Haley who spent half her time on the phone all day with CEOs bringing new biz (and tax money) to SC - BMW, Boeing, Amazon, on and on.
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  #54  
Old 10-04-2017, 06:30 PM
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Originally Posted by BMWfandude View Post
I've heard/read nothing but negative comments about run flats and expected it to be at least 75% for NRF.
It might be that the RFT-ers have never driven a BMW without RFT's. Also, most people don't check their tire pressure until they get a warning on TPMS, which is believe is 20% below the recommended pressure. Let out enough air, and even RFT's ride good.
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  #55  
Old 10-04-2017, 07:11 PM
Ore_328I Ore_328I is offline
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My 328i came with rft by pirelli the traction is rated at aa y91

Which I am to understand is awesome traction. (And speed rating )

How would non rft handle better if their rates the same?

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  #56  
Old 10-04-2017, 07:31 PM
Ore_328I Ore_328I is offline
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Double post

Last edited by Ore_328I; 10-04-2017 at 07:33 PM.
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  #57  
Old 10-04-2017, 07:58 PM
Autoputzer Autoputzer is offline
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Originally Posted by Ore_328I View Post
My 328i came with rft by pirelli the traction is rated at aa y91

Which I am to understand is awesome traction. (And speed rating )

How would non rft handle better if their rates the same?

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The reason radial tires handle so well, get better fuel economy, and last longer is that the cords in the sidewalls are only in the radial direction (hence the name). Cords don't stretch. Since they're only in the radial direction, the sidewalls can stretch in the circumferential direction (90 degrees off from the radial direction). That sidewall stretching is why radial tires often have a bulge in the sidewalls at 6 o'clock. That sidewall stretching also lets the tread face better conform to the road surface.

RFT's are radials, but the stiff sidewall can't stretch as much as on a non-RFT radial. So they don't perform as well. That's why M cars and 2/3/4 Series cars with the track handling package come with non-RFT's.

That DOT traction rating is only for wet traction.
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  #58  
Old 10-04-2017, 09:13 PM
Ore_328I Ore_328I is offline
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Excellent information, I appreciate your time.


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