[too hot]

Originally Posted by R99

Think you may have issues with 245/35 & 265/35 and x-drive mate as the x-drives need to be within 1% rolling radius front to rear!

What happens if they are not .

[R99]

Originally Posted by too hot

What happens if they are not .

You get issues with handling & power delivery between the driven wheels!

Also sometimes a dash / iDrive warning

235/40 & 265/35 will be perfect for x-Drive

[Oompah]

If I may... I have an xdrive f30 and I just did 437's.

As R99 says, you need to remain within 1% difference. Introducing variations takes you out of the tolerance and will affect xdrive.
Based on my experience, you WILL rub in front running 235 40 19 with mps4s.
I have no idea if you will get the same issue with older mpss.
In the wheel arch inserts/trim are not flat, they have "ups and downs" and on perhaps 50% lock either way there is a contact - very small and potentially only when the car is in motion and going through a long dip.
Keeping in mind the marking I can see, the contact wont happen if the tires will lose 2mm of tread. It's literally this small.

[R99]

Originally Posted by thelowkick

If I may... I have an xdrive f30 and I just did 437's.

As R99 says, you need to remain within 1% difference. Introducing variations taking you out of the tolerance will affect xdrive.
Based on my experience, you WILL rub in front running 235 40 19 with mps4s.
I have no idea if you will get the same issue with older mpss.
In the wheel arch inserts/trim are not flat, they have "ups and downs" and on perhaps 50% lock either way there is a contact - very small and potentially only when the car is in motion and going through a long dip.
Keeping in mind the marking I can see, the contact wont happen if the tires will loose 2mm of tread. It's literally this small.

Didn’t realise you had rubbing upfront!

[Oompah]

Originally Posted by R99

Didn’t realise you had rubbing upfront!

Yup, literally it's scraping the dirt off the trim.

[too hot]

Originally Posted by R99

You get issues with handling & power delivery between the driven wheels!

Also sometimes a dash / iDrive warning

235/40 & 265/35 will be perfect for x-Drive

Do you know if the standard fit 330d tyres(225/40/19+255/35/19) will fit the 437`s without any adverse problems?

[R99]

Originally Posted by too hot

Do you know if the standard fit 330d tyres(225/40/19+255/35/19) will fit the 437`s without any adverse problems?

Yes they will fit the wheels - but the stretch would be pretty severe. Certainly wouldn’t be to my taste personally. You might be OK with it though?

You could sell the MPSS you have on your 437’s now to recoup some funds towards new tyres - I presume you bought some from an M2 if yours came with those tyres?

[too hot]

Originally Posted by R99

Yes they will fit the wheels - but the stretch would be pretty severe. Certainly wouldn’t be to my taste personally. You might be OK with it though?

You could sell the MPSS you have on your 437’s now to recoup some funds towards new tyres - I presume you bought some from an M2 if yours came with those tyres?

Yeah that's right they came off an M2.They are absolutely as new and the tyres have only done 150 miles.Don`t want the ridiculous stretch either.
I`m currently thinking of removing the tyres and selling them as you say to recoup some cash to get the right size for the 330d.Only really need to change the fronts to 235`s then?

[R99]

Originally Posted by too hot

Yeah that's right they came off an M2.They are absolutely as new and the tyres have only done 150 miles.Don`t want the ridiculous stretch either.
I`m currently thinking of removing the tyres and selling them as you say to recoup some cash to get the right size for the 330d.Only really need to change the fronts to 235`s then?

Did you get the ones from Denso? He had a brand new set up for grabs!

Yes that’s right 235/40 will give you rolling radius of within 1% when paired with a 265/35.... however be aware of what has been posted earlier with regard to rubbing

[too hot]

Originally Posted by R99

Did you get the ones from Denso? He had a brand new set up for grabs!

Yes that’s right 235/40 will give you rolling radius of within 1% when paired with a 265/35.... however be aware of what has been posted earlier with regard to rubbing

The rubbing issues don't seem too bad

Yuup they are Denso`s wheels and they are like new!!
Off to price up tyres!!

[Rbrown]

Originally Posted by too hot

The rubbing issues don't seem too bad

Yuup they are Denso`s wheels and they are like new!!
Off to price up tyres!!

Don't forget to give these brake callipers a good clean when the wheels are off!

[too hot]

Originally Posted by Rbrown

Don't forget to give these brake callipers a good clean when the wheels are off!

You mean you didn't ????

[R99]

Originally Posted by Rbrown

Don't forget to give these brake callipers a good clean when the wheels are off!

It’s a doddle with the 437’s - 1st thing I noticed once fitted was how much more caliper is on show! Plenty of room to get your hands in to clean them!

[Rbrown]

Originally Posted by too hot

You mean you didn't ????

Of course I did - but they will be getting dirty after this winter!

Interestingly, I am looking at changing the tyres on the M40i!

[R99]

Great - the PRP seem to have given a decent rear lift - any before and after shots showing the ride height comparison?

[Oompah]

Originally Posted by R99

Great - the PRP seem to have given a decent rear lift - any before and after shots showing the ride height comparison?

I don't have specific comparison photos but have a look at this one here.
As much as it looks lovely and flush... It's great when it's stationary but any form of heavier weight would have caused rubbing.
The biggest problem however was combo h&r springs for xdrive (40mm drop) and standard xdrive dampers. By the looks of it the spring was not long enough and wasn't taking enough beating, majority of it was going directly via damper.
This caused a pretty rough ride, as you can imagine. Not to mention the front wheel arch clearance was much bigger, creating much disliked reverse rake look.

As you know, when I initially saw 5~mm thick PRP spacer I was convinced it wont make any difference, however it appears this 5~mm piece of plastic was just what was required to engage the spring and take some load of the dampers.
Yes, i could have replaced dampers with b8s etc but it seems that a £7 PRP fixed the problem. I am glad I gave it a try and installed them because it saved me quite a lot of money as I was about to pull the trigger on KW coils. I may still go this way but at this moment I am happy.
With PRP I saw around 8mm lift, which is exactly what I needed. You can't see it on the photos but pre-prp set up wasn't even allowing my to put one finger between fender and tyre. There was less than 10mm clearance, now there is 17mm.
Comfy set up with no reverse rake. Happy days.

I have to say I am very surprised I had to fiddle with h&r springs, lift them up etc. I always used h&r on all my BMW's and never had to make any additional changes. My last f11 was on their springs as well and it looked and handled just how it supposed to. And even though completely opposite side of the spectrum, my e31 looked great on h&r too. I think offering only 40mm drop for xdrive f30 and forcing customers to adapt the dampers or use prp is a bit of a shame. They should have known better.

[R99]

Looks my tip on the PRP paid off for you mate.

The problem is the X-drive is so high to start with - all springs give the x-drive reverse rake - ACS being the worst offender!

[Oompah]

Originally Posted by R99

Looks my tip on the PRP paid off for you mate.

The problem is the X-drive is so high to start with - all springs give the x-drive reverse rake - ACS being the worst offender!

Exactly, much appreciated J ;-)

[too hot]

How do you work out the rolling radius ? As in how can you tell if your tyres are within 1% ?
I have been offered a set of 235/40/19 and 255/35/19 at a good price was wondering if they will work on the Xdrive without issue ?

[R99]

255/35 will be really stretched on the rear!

Plus those sizes have a 1.5% difference

[too hot]

Originally Posted by R99

255/35 will be really stretched on the rear!

Plus those sizes have a 1.5% difference

How do you work out that ??

[R99]

Originally Posted by too hot

How do you work out that ??

Using an online tyre size calculator!

You have 245/35 & 265/35 on your M2 spec 437m’s don’t you, so if you are trying to make use of one pair of existing tyres then your options would be:

235/40 & 265/35 OR 245/35 & 255/35 - however the stretch of a 255/35 on a 10j will be too much.

Best option for x-drive is the first one - 235/40 & 265/35. Or you could downsize all together & do 245/35 & 285/30 but unsure if that would fit!