What IS the point of Run Flats?

sunshinetours

mikey72 wrote: »

Which ones have an 80mph limit?

Lum wrote: »

Careful, most of them have an 80kmh limit, or 50mph.

Better to check the tyre sidewall than the manual IMO. Someone may have replaced the spacesaver with a different brand.

Wonder if Linglong make spacesavers?

I am aware of difference between mph and kph thanks

One link

No idea how many cars actually have them but they certainly exist

mikey72

sunshinetours wrote: »

I am aware of difference between mph and kph thanks

One link

No idea how many cars actually have them but they certainly exist

"Renault admitted it had made a mistake"

And there is actually legislation on a 50mph limit on spacesavers.
(Apart from them blowing up)

Lum

sunshinetours wrote: »

I am aware of difference between mph and kph thanks
One link
No idea how many cars actually have them but they certainly exist

I'm not saying you aren't, but it's still dangerous advice to be giving out on a non-enthusiast forum like this, when some of these tyres are only marked 80kph, not 50mph, and the vast majority out there in people's cars are the 50mph/80kmh kind.

The best advice to give to people is to check what it says on the tyre, and hope they don't drive a MY2009 Renault Laguna

Also, your own link points out that it's illegal to go above 50mph on a space saver, even if it's rated for 80.

sunshinetours

About the labelling, not the fact they were safely tested to 80mph by Continental though. UK legislation limits them. There's a difference and certainly doesn't mean they will blow up which I believe was my original point

harveybobbles

sunshinetours wrote: »

I am aware of difference between mph and kph thanks

One link

No idea how many cars actually have them but they certainly exist

From that link...

How we did it

To do the tests, we went to the Motor Industry Research Association (MIRA)proving grounds in Warwickshire with four cars, each fitted with a different tyre set-up. Our Subaru Justy came with a 50mph space-saver, a Renault Laguna had the new 80mph tyre, a MINI Clubman featured run-flats and a VW Passat CC was fitted with new self-sealing rubber.

Seems a very unfair test to be honest.

They should have used one car and changed the tyres about.

mikey72

sunshinetours wrote: »

About the labelling, not the fact they were safely tested to 80mph by Continental though. UK legislation limits them. There's a difference and certainly doesn't mean they will blow up which I believe was my original point

I don't see how that related to the question on 50mph spacesavers?
It means you have managed to find a new type of spacesaver, which is bigger, and has a higher speed rating than the old 50mph spacesavers.
So if you want to rephrase the question as to whether or not the new 80mph spacesaver will overheat if you run it over 80mph and over it's approved milage, maybe it'll blow up as well then.

sunshinetours

mikey72 wrote: »

I don't see how that related to the question on 50mph spacesavers?
It means you have managed to find a new type of spacesaver, which is bigger, and has a higher speed rating than the old 50mph spacesavers.
So if you want to rephrase the question as to whether or not the new 80mph spacesaver will overheat if you run it over 80mph and over it's approved milage, maybe it'll blow up as well then.

It isn't new - point is I assumed the 50mph limit is legislation based and that is now confirmed - it has nothing to do with tyres exploding (although I of course accept they could). The orioginal point you made was about spacesavers exploding and I said run flats were more likely to collapse that space savers expoling after 50 miles plus

To be honest its now all a bit confused - so I'm done!

mikey72

sunshinetours wrote: »

It isn't new - point is I assumed the 50mph limit is legislation based and that is now confirmed - it has nothing to do with tyres exploding (although I of course accept they could). The orioginal point you made was about spacesavers exploding and I said run flats were more likely to collapse that space savers expoling after 50 miles plus

To be honest its now all a bit confused - so I'm done!

Your link says it is.

"However, the introduction of an all-new space-saver, with a higher 80mph speed rating, looks set to shake up the industry"

Read more: http://www.autoexpress.co.uk/news/autoexpressnews/230895/are_spacesavers_safe.html#ixzz1feRDCAUM

sunshinetours

mikey72 wrote: »

Your link says it is.

"However, the introduction of an all-new space-saver, with a higher 80mph speed rating, looks set to shake up the industry"

Read more: http://www.autoexpress.co.uk/news/autoexpressnews/230895/are_spacesavers_safe.html#ixzz1feRDCAUM

Are space-savers safe?
Posted: 07 November 08 in News
Traditional spare tyres are becoming a thing of the past ��\ but can you rely on the skinny rubber in your car’s boot? We put it to the test. If you look in your car’