Z4 M40i

T

tweeky687

Member
 Halifax
Hi all.
Please be gently on me I`ve just ordered A Z4 M40i for delivery in May.
Can anybody tell my the PCD and the centre bore Diameter.

My current car is an M340I and I`ve two set of wheels for it a set of 19 inch M898`s used for summer and set of 18inch 780 used for winter, Will either of these wheels fit?

Thanks in advance.

Mark
 
tweeky687 said:
Hi all.
Please be gently on me I`ve just ordered A Z4 M40i for delivery in May.
Can anybody tell my the PCD and the centre bore Diameter.

My current car is an M340I and I`ve two set of wheels for it a set of 19 inch M898`s used for summer and set of 18inch 780 used for winter, Will either of these wheels fit?

Thanks in advance.

Mark
Click to expand...

Welcome…here you go..answers to the universe..

https://www.wheel-size.com/
 
Hello and welcome, the standard winter wheel/tyre for the Z4 M40i is a square 255/40 R18 on a 18 x 8.5 alloy ET 30. I run 255/35 R19 on 19 x 8.5 with Continental AllSeason Contacts and do not have an issue with grip in everyday use when it's cold and wet or frosty, a few inches of snow is not much of a hindrance, it's always the back that gives up first and it is controllable.

If your standard winter setup is 225/45 R18 on ET25, this has a similar diameter to 255/40 R18 and the poke is 8mm less than standard, so you could get a set of 10mm spacers to bring them out a bit, the key question is traction and stopping having less contact rubber.
 
I got a pair of cheap winter tyres to put on S/H rims, rubber compound seems very soft so I’m not expecting long life, maybe they will do 2000 miles before I change back in March
 
I don't have the need for winter tyres. If snow and or ice, she stays in the garage 8)
 
sars said:
Nanu said:
I don't have the need for winter tyres. If snow and or ice, she stays in the garage 8)
Click to expand...
Got your new tyres fitted yet?
Click to expand...
Just fitted last Friday when returned from holidays. £665 for all four fitted, new valves not required. Haven't had the opportunity to give them a good run out yet but do seam a little quieter. Will give them a proper run over the next couple of days.
Had to enter them on the idrive manually as not recognised automatically but all seams to be working fine.
 
Nanu said:
sars said:
Nanu said:
I don't have the need for winter tyres. If snow and or ice, she stays in the garage 8)
Click to expand...
Got your new tyres fitted yet?
Click to expand...
Just fitted last Friday when returned from holidays. £665 for all four fitted, new valves not required. Haven't had the opportunity to give them a good run out yet but do seam a little quieter. Will give them a proper run over the next couple of days.
Had to enter them on the idrive manually as not recognised automatically but all seams to be working fine.
Click to expand...
Yep, I had to do that too, I wonder how the auto recognition works?
 
Got your new tyres fitted yet?
[/quote]Just fitted last Friday when returned from holidays. £665 for all four fitted, new valves not required. Haven't had the opportunity to give them a good run out yet but do seam a little quieter. Will give them a proper run over the next couple of days.
Had to enter them on the idrive manually as not recognised automatically but all seams to be working fine.
[/quote]
Yep, I had to do that too, I wonder how the auto recognition works?

[/quote]The ride feels softer and less noise. Handling seems to be good, so far the car has gone in the direction I have pointed it which is a good sign. Confused re the pressures. One BMW site says 2.2 bar all round the car monitor recommends 2.3 bar and tyres currently 2.4 bar which the garage says is the correct pressure.
What do you run yours at?
 
[ref]Nanu[/ref],
I think this may classify as a thread hijack :D
If you go to the screen where you had to configure the tyres, somewhere in there are three tyre pressure setting options, partially loaded comfort and eco and fully loaded. Each setting has different pressure settings, so dependant on temperature, comfort is 2.2 bar and eco is higher, I think 2.6 bar, mine are set at 2.3 bar. So anything between >2.2 and <2.6 bar is okay as long as they're all the same that is.
 
sars said:
Hello and welcome, the standard winter wheel/tyre for the Z4 M40i is a square 255/40 R18 on a 18 x 8.5 alloy ET 30. I run 255/35 R19 on 19 x 8.5 with Continental AllSeason Contacts and do not have an issue with grip in everyday use when it's cold and wet or frosty, a few inches of snow is not much of a hindrance, it's always the back that gives up first and it is controllable.

If your standard winter setup is 225/45 R18 on ET25, this has a similar diameter to 255/40 R18 and the poke is 8mm less than standard, so you could get a set of 10mm spacers to bring them out a bit, the key question is traction and stopping having less contact rubber.
Click to expand...

So would that be spacers all round or just on the rears.

Thanks in advance.
 
tweeky687 said:
So would that be spacers all round or just on the rears.

Thanks in advance.
Click to expand...

Apologies, poke front is 8 mm and rear is 17 mm!, suggest you fit the rears and see how much room you have between the inside of the wheel arch to the outer edge of the tyre before buying 15.0mm spacers because 275 on a 10" wheel is slightly less stretched than a 225 on 7.5" wheel.

This explains why my rears look a little inbound compared to the normal rears which are 275/35 R19 as there is 5.0mm less poke and a smaller diameter.

IMG_3444[1].jpg
 
Any experiences with the 17” 768 winterset on the M40i (with 225x50 Bridgestone blizzak lm001 tires) ? They do seem to fit.
 

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Wolter said:
Any experiences with the 17” 768 winterset on the M40i (with 225x50 Bridgestone blizzak lm001 tires) ? They do seem to fit.
Click to expand...

They may "fit" but you'd need to check they clear the calipers, big brakes on the M40
 
Sars,
Your 19 inch set up what ET is that? Also what wheels are they in the photo you posted? I`m looking at s set of Bola`s in 18 but is the 19`s work i may look at that set up.
 
tweeky687 said:
Sars,
Your 19 inch set up what ET is that? Also what wheels are they in the photo you posted? I`m looking at s set of Bola`s in 18 but is the 19`s work i may look at that set up.
Click to expand...
The alloys are Ispiri FFR1 Matt carbon bronze they are 19 x 8.5 ET32
 
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