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Z4M vs. Stock Z4 Tyre Set Up

Alloy wheels and tyre discussion
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kis
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Z4M vs. Stock Z4 Tyre Set Up

Post by kis » Mon Feb 06, 2017 9:44 am

Further to a post I made on the Buy and Sell side regarding some tyre fitments, I learned something new about tyre sizes. So the M spec wheels are the same as a standard spec Z4. Assuming they are 18" diameter with the usual PCD and bore. 8J and 8 & 1/2J for the front and rear respectively. (Lets ignore the 224's for now which have the 9J rear and for that matter the difference in wheel offsets).

M spec for tyres run on a higher profile. So a usual 18" set up is as follows:

225/40/18
255/35/18

The M set up:

225/45/18
255/40/18

What are the advantages and disadvantages of running either set up? Based on a scenario where a stock (non M) Zed is being used.

Thanks :)
My E85 Z4 3.0i SMG

BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71

jamie_z4
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Z4M vs. Stock Z4 Tyre Set Up

Post by jamie_z4 » Mon Feb 06, 2017 9:46 am

comfort of bigger sidewalls is the main advantage. i know Mr Wilks likes his comfy tyre sizes 8)
18 Z4s owned to date.

Current: 2.5i Titan silver

Daily driver: 480bhp M140i Shadow edition.

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kis
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Z4M vs. Stock Z4 Tyre Set Up

Post by kis » Mon Feb 06, 2017 9:47 am

Thats what I was thinking! :thumbsup:
My E85 Z4 3.0i SMG

BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71

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mr wilks
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Z4M vs. Stock Z4 Tyre Set Up

Post by mr wilks » Mon Feb 06, 2017 10:59 pm

jamie_z4 wrote:comfort of bigger sidewalls is the main advantage. i know Mr Wilks likes his comfy tyre sizes 8)
Its my ageing bones you know :oops: other benefits are better protection for the alloys themselves on our badly maintained roads & for those who want the look of lowering without actually doing so the larger sized rubber also helps close the arch gap :wink: not that you would need that now J :P
3 ZMRs
3 E89s
5 Si coupes
5 Si roadsters
997 C4
TTRS
F82 M4
MK7 Golf Gti
current Bmw 6 Gran Turismo

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kis
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Z4M vs. Stock Z4 Tyre Set Up

Post by kis » Tue Feb 07, 2017 12:34 pm

Good points to note, thanks! I had a quick look at prices as well, unfortunately they're going up in price instead of down :headbang:
But I think having the large profile would probably help, with roads being in the condition they are, and also for the well-being of the alloy itself! Just an added bonus to fill the arch gap a little bit :)
My E85 Z4 3.0i SMG

BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71

Zoomer
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Z4M vs. Stock Z4 Tyre Set Up

Post by Zoomer » Tue Feb 07, 2017 6:57 pm

I run 224s on my 3.0 with M size tyres and find they look good and the ride is much improved.
Sterling Grey 3.0i E85 Black Heated Leather M sports seats , 224's ,Sat Nav, Bluetooth, Xenons, PDC, Gaptech ,Cruise and a nice warm garage. NOW GONE
Silver 3.0i Z4 NOW GONE

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