Z4 Tyre Pressures

[Nigel P]

May be a dumb question from a new member. I am about to change all 4 run-flats for ordinary rubber. Do the BMW recommended tyre pressures still apply? If not what pressures do I use, those recommended by the tyre manufacturers?

Nigel P

[JimmyPop]

What tyres are you using? For most of the common non-runflats you should be able to find a thread on here detailing everyone's preferred tyre pressures. I have Vreds on mine and most people recommended NOT using the pressures listed on their website.

Also, welcome! Why not post a wee thread in the newbies section (with pics!)

[RCT_Z4Coupe]

May be a dumb question from a new member. I am about to change all 4 run-flats for ordinary rubber. Do the BMW recommended tyre pressures still apply? If not what pressures do I use, those recommended by the tyre manufacturers?

Nigel P

Nigel - would be very interested to know how you get on changing from RFT's to ordinary rubber, and how the car performs. Thinking of ditching mine at some stage. However, I dropped the pressures on mine to 32/35 (lower than the recommended pressures) and it does ride a lot nicer.

[Psy]

However, I dropped the pressures on mine to 32/35 (lower than the recommended pressures) and it does ride a lot nicer.

Hmm, will try this too - thanks for tip.
Si

[lacroupade]

I don't know the exact numbers between the Z4M and the Z4 3.0 (someone might want to advise?) , but given the former has non-RFTs and its recommended tyre pressures are, I think , 3 psi or so lower than the 3.0 with its RFTs, lowering them a bit when fitting RFTs makes sense....

[RCT_Z4Coupe]

However, I dropped the pressures on mine to 32/35 (lower than the recommended pressures) and it does ride a lot nicer.

Hmm, will try this too - thanks for tip.
Si

Be interested to know how you got on

[Adamski]

May be a dumb question from a new member. I am about to change all 4 run-flats for ordinary rubber. Do the BMW recommended tyre pressures still apply? If not what pressures do I use, those recommended by the tyre manufacturers?

Nigel P

I use more or less the manufacturer stated pressure with non RFTs. All good here

[Finisterre]

I have tried several just to see what they feel like
first two on eagle f1 and the other three michelin winter (alpin)

34 - 34
32 - 32
30 - 30
32 - 35
33 - 38

It doesn't make a deal of difference soft are comfy, hard are twitchier.
I think I am going to try 34 -36 next week...
This is on a 2.0. which feels a bit 'throw-ier' to me than the 3.0.

[lacroupade]

I have tried several just to see what they feel like
first two on eagle f1 and the other three michelin winter (alpin)

34 - 34
32 - 32
30 - 30
32 - 35
33 - 38

It doesn't make a deal of difference soft are comfy, hard are twitchier.
I think I am going to try 34 -36 next week...
This is on a 2.0. which feels a bit 'throw-ier' to me than the 3.0.

Out of interest, given the softer compound on your winters and the fact that temperatures have regularly been above the recommended 7c, do you think its a fair comparison, as surely they will be running more like a flatter tyre already?

[Stromtech]

I dropped the pressures on mine to 32/35 (lower than the recommended pressures) and it does ride a lot nicer.

Thanks for that tip...I was at 33/36 and I dropped mine to 32/35 a couple of days back and went for a blast down a windy poor surfaced road...there was a difference in comfort. RFTs with the M Sport suspension package on my car are just too harsh for my liking, particularly in this cooler weather (5-7C). Your suggestion makes the ride more bearable. Now I may hold off till the late Summer to buy new tires as I still have 70% on these RFTs.

[Finisterre]

Comfort-wise I can't tell the compounds apart. But the winter grip is amazing. I put the winter tyre pressures up to see if the smaller footprint might give me a bit more sideways action when thrashing around the lanes. I am not getting any movement except on packed snow.
So that was a bust

[fazeryam]

Hi
Is anyone using Bridgestone non runflats? What pressure would you recommend?

[Psy]

However, I dropped the pressures on mine to 32/35 (lower than the recommended pressures) and it does ride a lot nicer.

Hmm, will try this too - thanks for tip.
Si

Ok, checked preasures today - way to low!

I was at 24/29 - I increased to 32/35.
So, opposite to RCT above...

Car feels sharper and more responsive on the stearing wheel, less 'pull' on the wheel.
Far more feedback coming to driver at this pressure. May be in my head, but feels great.

Havent tried higher pressures.

Si

[Bing]

Psy, it's not in your head - tyre pressures that low will feel awful, and wear your tyres a lot faster. Glad you sorted it out, enjoyment will be doubled