Replaced my Runflats

[donteatthat]

Hi Folks, so i took the leap and replaced all 4 run flat tyres on my 2.5 Z4 yesterday to normal reinforced tyres, i had 2 balding tyres and one puncture so thought just do it. Never thought i would really notice the different but wow, the ride is so much more forgiving.

Pirelli P Zero's

Anyway im a bit of a Sunday driver so take from that what you will but hope this helps.

Simon.

[lux]

Glad you're happy with 'em....I like my fillings to rattle when I drive over a crisp packet!!

[obewan]

I like my fillings to rattle when I drive over a crisp packet!!

Don't get it - it's a sports car, why convert it to an Austin Allegro (google may be required )
Each to their own I guess, glad you like them

[dr_john]

Are you talking about an E89? I'm not sure what a 2.5 z4 is.

[Nictrix]

Are you talking about an E89? I'm not sure what a 2.5 z4 is.

Ours is a 2.5.
The 23i is a 2.5 litre engine

[thepits]

Are you talking about an E89? I'm not sure what a 2.5 z4 is.

it's posted in the E89 Z4 discussion (2009+) forum, so one assumes he is

[dr_john]

Are you talking about an E89? I'm not sure what a 2.5 z4 is.

Ours is a 2.5.
The 23i is a 2.5 litre engine

Yes I know that, I used to have one.

It's just that most people would call it a 23i

[R.E92]

I like my fillings to rattle when I drive over a crisp packet!!

Don't get it - it's a sports car, why convert it to an Austin Allegro (google may be required )
Each to their own I guess, glad you like them

When you drop runflats you don't lose any of the handing ability of the car. You just gain grip, comfort and less noise.

[obewan]

When you drop runflats you don't lose any of the handing ability of the car. You just gain grip, comfort and less noise.

Sorry you've softened the suspension - handling must be affected
You gain comfort, I will agree with you there

[flybobbie]

I put on non-rft, the handling improved a lot, like not trying to wander into oncoming traffic!
Something else i did was to replace the rear std shocks.
Then the little traction control light stopped flashing on light gravel.

[sars]

When you drop runflats you don't lose any of the handing ability of the car. You just gain grip, comfort and less noise.

Sorry you've softened the suspension - handling must be affected
You gain comfort, I will agree with you there

Fitting non RFT's doesn't change the suspension, I mean how could it

Non RFT's have a less stiff sidewall (as in they won't keep the tyre shape without air) so yes your handling will be subtly different, however there is an easy fix....just increase the tyre pressures by a small amount until you are happy (not to much mind as you will get uneven tyre wear).

Also a car with 19" RFT's will handle differently than the same car with 17" RFT's

[obewan]

Sars
The tyres are part of the suspension - in fact in F1 most of the suspension travel is in the tyre sidewall
So unless you do what you say and increase the pressure, there will be side wall flex laterally and vertically

Not knocking anybodies choices - let I said, each to their own
I'm happy with the RF's -

[sars]

Sars
The tyres are part of the suspension - in fact in F1 most of the suspension travel is in the tyre sidewall
So unless you do what you say and increase the pressure, there will be side wall flex laterally and vertically

Not knocking anybodies choices - let I said, each to their own
I'm happy with the RF's -

Okay I'm being semantic, but the tyres are not classified as part of the suspension system, but I know I'm not going to convince you......

suspension travel refers to how much the hub can move relative to the car, what you mean is how much the car can move relative to the ground, and yes in F1 tyre pressures are adjusted to improve handling and that's where I started

[ric19]

I understood that BMW tuned the suspension to take account of the run flats

[R.E92]

I understood that BMW tuned the suspension to take account of the run flats

I'm sure if that were the case the suspension would be softer. I can't imagine BMW testing the cars with runflat tyres and sports suspension and thinking it was suitable for road use!

I think that quote is something sales people use to make sure customers come back and pay them large sums of money for replacement runflat tyres.