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Old 12th December 2018, 22:08   #1
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Default Run flats or not ?

Looking at New rubber for the ZT (225/45/18) and run flats are an option so did some reseach on them and the pro's and cons and can't really decide.

Pro's

Weight saving ( no need to carry a spare wheel or changing kit ).

Safer (no trying to change wheel possibly on a busy, dark road or hard shoulder of a motorway ).

More convenient ( no dirty wheel changing in best suit / rain / freezing cold etc.

Cons

More expensive ( over £30 a corner ).

Harsher ride ( sidewalls are stiffer to support car when flat).

Shorter life ( reports say up to 6000 miles less).

Some reports say not recommended without a tyre pressure monitoring system as you could have a flat without knowing, causing you to possibly exceed the tyres design limits which could cause the tyre to disintegrate, possibly at speed.

Can see the pro's, but outweighed by the cons ??????
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Old 13th December 2018, 00:50   #2
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I stand to be corrected, but I had the impression it was a legal requirement to have a tyre pressure monitoring system when running runflats. Also that the wheels were designed to take runflats.
But, I could be wrong.
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Old 13th December 2018, 04:22   #3
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Fit them at your peril, the increase in unsprung weight will leave your fillings rattling

I know as I fitted a set to the ZT, they stayed on the car for all of a week before being removed as the ride was totally unbearable

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Old 13th December 2018, 06:27   #4
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Got to agree with Brian had 4 on one of my ZTs and the ride was terrible plus I was constantly checking tyre pressures as you never knew if you had a flat tyre.
Avoid and just get a decent premium brand.
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Old 13th December 2018, 08:51   #5
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Will concur, when I first got my Limo it was fitted with run flat Tyres and the steering was all over the place, was then told our cars are not suited to these type of Tyres.

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Old 13th December 2018, 09:00   #6
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BMW forums are littered with reports of people dumping run flat tyres and reverting to conventional tyres.
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Old 13th December 2018, 09:24   #7
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I've got a pair on the front of my ZT.

I wouldn't have chosen them myself, but opted for a set of part worn winter tyres and a pair happened to be run flats.

Cant say I've noticed any difference, although the run flats seem to hold pressure (the wheels need a refurb) The rear non run flats need topping up every week.

You can get tyre monitoring kits on amazon - someone posted on here the other day, around £30 I believe.
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Old 13th December 2018, 17:26   #8
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but a flat tyre is still a flat tyre and needs to be "repaired" at some point.

Your away from home perhaps with a load of some description, its late Sunday and you don't know the area.
Run flat has a puncture, you have to find somewhere to change / repair as you have 100 miles or more to go. Recommended driving is 50 miles on a flat run flat depending on load. Even if a week day you may not be able to get a replacement tyre that day and then what happens tomorrow?
Spare wheel, change and go.

I see your pros and cons, perhaps old fashioned and don't like change but I'll go with a conventional spare wheel

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Old 13th December 2018, 20:16   #9
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Does it not potentially have implications regarding car insurance when fitting ' non standard ' items to a vehicle.

Similar to fitting a different tyre width or profile?
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Old 13th December 2018, 20:21   #10
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Quote:
Originally Posted by Typhoon190 View Post
Does it not potentially have implications regarding car insurance when fitting ' non standard ' items to a vehicle.

Similar to fitting a different tyre width or profile?
declare it and insurance will decide if its an issue or not

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