Why do runflats RUN FLAT more than regular tires?

wtzouris · 08-07-2008, 11:51 AM

All I've heard from everybody about runflats is that you get more flat tires.

I have friends who said avoid runflats on the Toyota Sienna, the Mini Cooper S, and now the 128/135i

Why would this technology fail more often than a regular sidewalled tire?

William

rcracer_tx · 08-07-2008, 12:21 PM

The major problem with runflats is there is almost no give in the sidewall so if you get a flat the sidewall remains stiff enough to drive on.

While in theory this is brilliant, the tires is a major component for dampening the shock to the the wheels and suspension. This means that going over hard bumps with runflats can burst the tire or break the wheel much easier, and makes the suspension work much more to compensate for the stiff tires.

TazioNYC · 08-07-2008, 02:20 PM

There have been 4 or 5 burst tire stories (including mine) on the forum, all from running over bumps or hitting potholes.

Night1 · 08-08-2008, 12:41 AM

Quote:

Originally Posted by rcracer_tx

The major problem with runflats is there is almost no give in the sidewall so if you get a flat the sidewall remains stiff enough to drive on.

While in theory this is brilliant, the tires is a major component for dampening the shock to the the wheels and suspension. This means that going over hard bumps with runflats can burst the tire or break the wheel much easier, and makes the suspension work much more to compensate for the stiff tires.

Absolutely right.

In retrospect, I think my incident wouldn't have happened with regular tires.

http://www.1addicts.com/forums/showthread.php?t=13859

m3bs · 08-17-2008, 02:40 PM

I just got a screw through the edge of the tread in mine. Too close to the edge to patch. Great, another $300, and since it is such an oddball size, the car is down for a week. Great technology, this run flat tire.

Give me real tires, a jack and a spare, please.

08-07-2008, 11:51 AM	#1
wtzouris Private First Class 4 Rep 112 Posts Drives: 2014 328d xDrive Sports Wagon Join Date: Jun 2008 Location: New York, NY iTrader: (0)	Why do runflats RUN FLAT more than regular tires? All I've heard from everybody about runflats is that you get more flat tires. I have friends who said avoid runflats on the Toyota Sienna, the Mini Cooper S, and now the 128/135i Why would this technology fail more often than a regular sidewalled tire? William
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08-07-2008, 12:21 PM	#2
rcracer_tx Banned 55 Rep 2,013 Posts Drives: BSM 135i Join Date: Apr 2008 Location: Texas iTrader: (0)	The major problem with runflats is there is almost no give in the sidewall so if you get a flat the sidewall remains stiff enough to drive on. While in theory this is brilliant, the tires is a major component for dampening the shock to the the wheels and suspension. This means that going over hard bumps with runflats can burst the tire or break the wheel much easier, and makes the suspension work much more to compensate for the stiff tires.
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08-07-2008, 02:20 PM	#3
TazioNYC Lieutenant 37 Rep 466 Posts Drives: BMW 135i Join Date: Jun 2008 Location: New York, NY iTrader: (0)	There have been 4 or 5 burst tire stories (including mine) on the forum, all from running over bumps or hitting potholes.
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08-17-2008, 02:40 PM	#5
m3bs Captain 62 Rep 657 Posts Drives: 95 S54 M3, X5, GT4, GR Corolla Join Date: Feb 2008 Location: North Augusta, SC iTrader: (1)	I just got a screw through the edge of the tread in mine. Too close to the edge to patch. Great, another $300, and since it is such an oddball size, the car is down for a week. Great technology, this run flat tire. Give me real tires, a jack and a spare, please.
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