OHSCrifle
OHSCrifle GRM+ Memberand PowerDork
1/9/25 7:41 a.m.

I updated my 128i suspension to (factory optional) m-sport springs and struts and also acquired some m-sport wheels. This results in different tire sizes.

How can I determine the optimal pressures for the tires (that I have not yet purchased)?

Maybe I need to go check realoem.com and see if they sell door jamb stickers .. but I suspect some of you dorks can show me the way more quickly. 

Toyman!
Toyman! GRM+ Memberand MegaDork
1/9/25 8:26 a.m.

In reply to OHSCrifle :

You might see if your tire manufacturer has a load/pressure chart. They are readily available for truck tires, I don't know if they have them for passenger car tires. 

 

dps214
dps214 SuperDork
1/9/25 8:37 a.m.

How different is the size? If not wildly different some basic math will get you close. Beyond that, google might turn up some internet discussion about it, or go look at cars for sale and hope one has a photo of the label.

Johnboyjjb
Johnboyjjb HalfDork
1/9/25 8:56 a.m.

Wouldn't a car with the factory optional m-sport wheels have the revised sticker with the right information?

Otherwise, I would set them at 32 with the tread surface chalked or painted and look at how much your indicator wears off and where.

dyintorace
dyintorace GRM+ Memberand UltimaDork
1/9/25 8:58 a.m.

I'll check ours and report back. 

dyintorace
dyintorace GRM+ Memberand UltimaDork
1/9/25 9:08 a.m.

Here you go. 2010 128i M-sport

Curtis73 (Forum Supporter)
Curtis73 (Forum Supporter) GRM+ Memberand MegaDork
1/9/25 4:53 p.m.

I think you'll find that they're probably the same pressures within a few psi, unless you go crazy different.

The car hasn't changed weight, and within reason, it takes a certain amount of psi to suspend it correctly.  I changed my van from 235/75-16 to 275/55-20, and the same psi keeps them properly inflated.

1988RedT2
1988RedT2 MegaDork
1/9/25 5:35 p.m.

Using Hunter S. Thompson's novel "Fear and Loathing in Las Vegas" as the irrefutable authority on this subject, you should inflate the tires to the maximum listed on the sidewall, at least.  cheeky

VolvoHeretic
VolvoHeretic GRM+ Memberand SuperDork
1/9/25 5:42 p.m.
dyintorace said:

Here you go. 2010 128i M-sport

Does the yellow sticker say 36 and 44?

chandler
chandler MegaDork
1/9/25 5:54 p.m.
VolvoHeretic said:
dyintorace said:

Here you go. 2010 128i M-sport

Does the yellow sticker say 36 and 44?

Over 100mph

OHSCrifle
OHSCrifle GRM+ Memberand PowerDork
1/9/25 7:46 p.m.
dyintorace said:

Here you go. 2010 128i M-sport

That's the sticker! Pressures are the same as 205's all around - so "good to know". Thanks  

And thanks to everyone else too, for responding  

 

Pete. (l33t FS)
Pete. (l33t FS) GRM+ Memberand MegaDork
1/9/25 10:45 p.m.

I'm surprised that there isn't an all encompassing sticker in the fuel door.

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