Ideal Tire Pressure?

For those with either the 20" M Sport or 20" Individual rims, what is our ideal tire pressure, front and rear? Thanks!

DBS600, I check tire pressure all the time (frequently) on my cars, sport bikes. Many different tires over the years. F02 stock run flats or aftermarket non run flat Conti Extreme DWS, try the following week one, then week two, repeat as you wish to find best results. Must use digital pressure gauge with LCD readout 15-$22, non BMW part. Tire pressure rear pair and front pair must be exact not off 1/2 or 3/4 pound. Short drive to air 2-3 miles acceptable.

Digital Gauge http://www.pepboys.com/product/details/167202/
Digital Gauge http://www.sears.com/accutire-digita...p-02823001000P

Cold, parked 34.0r - 33.0f (rear-front)

Cold, parked 32.5r - 31.0f

Thanks for your prompt reply!

What's the reason for experimenting with the two different sets of numbers?

Does one combination improve acceleration while the other improves braking?

No, on your F02 it's only quality of ride. Maybe you prefer one set over the other.
Tell us exactly what is the air pressure in each of your tires 1REAR, 2 REAR, 3FRONT, 4FRONT, hot or cold...
Are you using a digital gauge, analog pencil gauge or air station gauge on the airline (guess the approximate pressure) to measure/set air pressure?

I believe I'm running a little over 30 at the rear and a little under 40 at the front...

Do different pressures help prevent bubbled tires or bent rims on low profile setups?

Open your owners manual and look for the page on basic settings for F01/F02 tire pressure.
Re read my first post, your settings and guessing is really ?????
I am going to take an ibuprofen right now....

In case you do not have your manual & the sticker is missing on your driver side door frame. I am running the M Sport wheels.


35lbs in the Front
38lbs in the Back

Thanks, Richard.

So why the factory sugested spec is different than Electro Editions? Which one should we go for??

Originally Posted by Individual750LI

So why the factory sugested spec is different than Electro Editions? Which one should we go for??

Measure your tire pressure @ cold and @ hot.
Tell us exactly what is the air pressure in each of your tires 1REAR, 2 REAR, 3FRONT, 4FRONT, hot or cold...
Are you using a digital gauge, analog pencil gauge or air station gauge on the airline (guess the approximate pressure) to measure/set air pressure?
Are your tires OEM run flat (name the brand and version) or aftermarket replacement non run flat?

It's difficult to tell, but does the attached state the following(?):

19" Wheels: Front: 32 psi, Rear: 32 psi
20" Wheels: Front: 35 psi, Rear: 35 psi
21" Wheels: Front: 38 psi, Rear: 38 psi

So pressures should be equal not only side-to-side, but front-to-back?

And is it true that mileage is better if pressures are higher, while handling is better and wear is increased if pressures are lower?

Otherwise, are wheels (rims) and tires more prone to damage (bends and bubbling) if tires are over-inflated?

I better check my air pressure, I think I inflated it to the max indicated on the tires.

DBS & INDIVIDUAL, neither has a clue on actual air pressure in your tires? Driving a $100k car and negligent responsibility to basic tire inflation?

At dusk I frequently see minivan drivers (usually a grossly obese operator) with the instrument panel lights turned up bright, I suppose they think the headlamps are also illuminated.

Seriously, were either of you raised by nannies?

Thanks for your input and concern, Electro, but I'm not sure why you're getting bent out of shape over this...? If the thread bothers you that much, don't name call, simply unsubscribe from it and focus on others. The reason I posted was that I've been having pulling issues with my car and after picking it up from the dealer I noticed that my tire pressures were lopsided, with the left side being about 10 psi less than the right. When I noticed this I used a cheap, poor readout pressure gauge to even things up, and as stated, I left things at a little over 30 at the rear and a little under 40 at the front, but according to Richard's post it seems I should have left the rear with more pressure than the front, but all in all, I think I'll keep things simple and keep pressures at 35 psi all around for my 20's.

DBS, I find it comical how you can drive a car with such a vague understanding of basic operational safety check as tire pressure.Thousands of automobile accidents and motorist deaths are due to improper tire inflation.
You continue to post about tire pressure and still have not posted an exact numerical value of what the air pressure is in your tires, only a vague thought or understanding of the actual air pressure.
I think you have proven in this thread to exhibit minimal understanding to basic safety with regard to tire pressure or you would not be asking the questions as stated.
Call your dealer, visit a filling station, get someone to perform a task for you, search the web for results, get it done.

I am far from getting bent out of shape or otherwise as you may see it. I posted as I found effective to bring to your attention something you should be more aware of.
As an operator of a motor vehicle you have a responsibility to others on the road to maintain and operate your vehicle in an safe manner.

Dude, something is seriously wrong with you. Do you get into these confrontations in person or just over the internet, where you can spew as you please? Relax and chill the f out! Thanks.

DBS, feel better?