Tyre pressure query & a note to the admins

L

lamaman

Member
 Lincolnshire, UK
Hi Folks,

Ive a question about the correct tyre pressures for my Z4 Coupe. Im running the bog standard Potenza 255/35/18 's and had a note from BMW stating 33psi on the front and 39psi on the rear. Seems a bit high to me - but there you go.

Ok, for the admins. I run a site not dissimilar to this for the company I work for and - if I might make a suggestion - wouldnt it be an idea to create a "reference" thread or page and dump all the technical info into there?

And, before those of you hankering to write a scathing response to my tyre pressure question - I dont have the sticker on the sill...

Mark
 
33psi is correct for the front, but the rears should be 36psi - as listed in your owner's manual (as you've already said you've not got a sticker - and why not?).
 
Its not in the owners manual either - unless someone can correct me?

Not sure why I haven't got a sticker - but I haven't - hence the question. And even if I did know why I didnt have one - well.... - it still wouldn't help would it?
 
lamaman said:
Its not in the owners manual either - unless someone can correct me?

Not sure why I haven't got a sticker - but I haven't - hence the question. And even if I did know why I didnt have one - well.... - it still wouldn't help would it?
Click to expand...


Page 78 of the owners manual (may vary with model/year etc).

All pressure specifications in the table are
indicated in psi/kilopascal with cold tires,
cold = ambient temperature
225/50 R 16 92 V
225/45 R 17 91 W
30/210 33/230
225/40 R 18 88 W 30/210 –
255/35 R 18 90 W – 33/230
205/55 R 16 91 Q/T/H M+S
225/50 R 16 92 Q/T/H M+S
225/45 R 17 91 Q/T/H M+S
30/210 33/230
You will find more information about permissible loads and weights on page 103.
Tire size Pressure specifications in psi/kPa
All pressure specifications in the table are
indicated in psi/kilopascal with cold tires,
cold = ambient temperature
225/45 R 17 91 W 33/230 36/250
225/40 R 18 88 W 33/230 –
255/35 R 18 90 W – 36/250
225/50 R 16 92 Q/T/H M+S
225/45 R 17 91 Q/T/H M+S
33/230 36/250
 
Thanks. Page 78 of my manual explains how to put fuel in the car. I havent anything in there on tyre pressures - just a disclaimer that should I need to know I should ask a dealer. Seems odd that BMW themselves said 39 Psi though..
 
lamaman said:
Thanks. Page 78 of my manual explains how to put fuel in the car. I havent anything in there on tyre pressures - just a disclaimer that should I need to know I should ask a dealer. Seems odd that BMW themselves said 39 Psi though..
Click to expand...

In mine, the fueling pages are only 2 pages before the tyre pages.
 
Well, just a quick update on the sheer range of responses from BMW and assorted dealers...bearing in mind Im using bog standard 108's with RFT's and with 225's on the front and 255 on the rear....

BMW Customer Services
Front : 33Psi
Rear : 37Psi

BMW Customer Services (E-mail)
Front : 33 Psi
Rear : 39 Psi

Stratstone Hull
Unable to discuss the correct tyre pressures without the resident expert looking at my (oem) vehicle in person.... :?

Soper Lincoln
Dont know, no idea. Could convert Bar to PSI for me though - which was very helpful. Not. :x

Astle Grimsby
Front : 36 Psi
Rear : wait for it...43.5Psi :o

So, in short - Im going with you guys on this one with 36psi in the rear's for now!.

Mark
 
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