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      03-08-2010, 12:44 PM   #1
AllAboutM
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Tire Pressure Question

Hey guys,
So I bought a M3 right before winter and so upon purchasing I had to store it. Now that the weather has warmed up (thank god) I can bring her out again. So I was wondering what the tire pressures should be set at, I have Iforged 360 rims with Nitto Invo (245/30/20 front and 295/25/20) rear. The tires say max 50psi. Before storing they were set at 26psi front and 28 psi rear. Should I stick with those pressures? what is the correct tire pressure? Thanks in advance for the input.

All the best!!!!
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      03-08-2010, 12:52 PM   #2
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Yes, I suppose I'm a hater.

You bought a high performance car for cruising around and looking cool.

Then you messed it up by putting on POS 20" wheels.

but to answer your question, you should be running those tires at at least 35 psi COLD. You have little tiny sidewalls that can't protect the stupid wheels you put on. You should probably run closer to 40 psi and give up some tire life and make the ride even worse.
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      03-08-2010, 01:38 PM   #3
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Quote:
Originally Posted by Radiation Joe;6870282,

You should be running those tires at at least 35 psi COLD. You have little tiny sidewalls that can't protect the stupid wheels you put on. You should probably run [B
closer to 40 psi and give up some tire life and make the ride even worse[/B].
I found that running higher tire pressures in my 335i with 18s (not RFT) actually improved the ride. It seemed totally counterintuitive so I returned to lower pressures for a while and then wnet back to hogher pressure. I am now running 40PSI and the ride quality is definitely better.

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      03-08-2010, 11:14 PM   #4
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Geez we got a hater here.....wat does POS mean? and FYI i never put those wheels on it, they came on it in addition to the fugly 18' stock rims which are sitting in the basement.


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Originally Posted by Radiation Joe View Post


Yes, I suppose I'm a hater.

You bought a high performance car for cruising around and looking cool.

Then you messed it up by putting on POS 20" wheels.

but to answer your question, you should be running those tires at at least 35 psi COLD. You have little tiny sidewalls that can't protect the stupid wheels you put on. You should probably run closer to 40 psi and give up some tire life and make the ride even worse.
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      03-09-2010, 11:46 AM   #5
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Quote:
Originally Posted by AllAboutM View Post
wat does POS mean?
Piece Of $hit . I just answered your question .
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      03-09-2010, 12:56 PM   #6
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Congratulations on your new M3. It does make sense to raise your pressures a little bit above the stock BMW recommendations due to your shorter sidewalls. Adding some air will protect the wheels more, and better support the weight of the vehicle. Max load bearing of a P Metric Standard load tire is 35 psi, which makes that solid starting point for your pressure settings. 26psi is definitely on the low side.

The hatred comes from the perception that 20" wheels are installed by those who are more concerned with image than performance. They are heavier, and the M3 tire sidewalls are already short enough that you do not have to go to bigger wheels to eliminate sidewall slop.

So if you go to the track you might want to throw some track tires on those "ugly" 18's you have, but for the street, the 20's are fine if you can keep out of the potholes.
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      03-09-2010, 06:23 PM   #7
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Thank you for the detailed response. Yes I have the stock 18's that I can throw on if i decide to track the car. I set the tire pressure to 35psi. thanks for all the help.


Quote:
Originally Posted by ben@tirerack View Post
Congratulations on your new M3. It does make sense to raise your pressures a little bit above the stock BMW recommendations due to your shorter sidewalls. Adding some air will protect the wheels more, and better support the weight of the vehicle. Max load bearing of a P Metric Standard load tire is 35 psi, which makes that solid starting point for your pressure settings. 26psi is definitely on the low side.

The hatred comes from the perception that 20" wheels are installed by those who are more concerned with image than performance. They are heavier, and the M3 tire sidewalls are already short enough that you do not have to go to bigger wheels to eliminate sidewall slop.

So if you go to the track you might want to throw some track tires on those "ugly" 18's you have, but for the street, the 20's are fine if you can keep out of the potholes.
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      03-10-2010, 10:02 AM   #8
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18's for winter

So why not use your 18s for winter tires since the selection of 18" winter tires is vastly superior to 19"+ in the U.S.?

That is what I am considering.
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      03-11-2010, 11:32 AM   #9
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That's also a good use for them.
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      07-23-2011, 06:27 AM   #10
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out of curiousity what would be the ideal tire pressure for running a Winter 240 Sottozero with 18s?


thanks in advance,
S

Quote:
Originally Posted by ben@tirerack View Post
Congratulations on your new M3. It does make sense to raise your pressures a little bit above the stock BMW recommendations due to your shorter sidewalls. Adding some air will protect the wheels more, and better support the weight of the vehicle. Max load bearing of a P Metric Standard load tire is 35 psi, which makes that solid starting point for your pressure settings. 26psi is definitely on the low side.

The hatred comes from the perception that 20" wheels are installed by those who are more concerned with image than performance. They are heavier, and the M3 tire sidewalls are already short enough that you do not have to go to bigger wheels to eliminate sidewall slop.

So if you go to the track you might want to throw some track tires on those "ugly" 18's you have, but for the street, the 20's are fine if you can keep out of the potholes.
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      07-23-2011, 06:29 AM   #11
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out of curiousity what would be the ideal tire pressure for running a Winter 240 Sottozero with 18s?


thanks in advance,
S

Quote:
Originally Posted by ben@tirerack View Post
Congratulations on your new M3. It does make sense to raise your pressures a little bit above the stock BMW recommendations due to your shorter sidewalls. Adding some air will protect the wheels more, and better support the weight of the vehicle. Max load bearing of a P Metric Standard load tire is 35 psi, which makes that solid starting point for your pressure settings. 26psi is definitely on the low side.

The hatred comes from the perception that 20" wheels are installed by those who are more concerned with image than performance. They are heavier, and the M3 tire sidewalls are already short enough that you do not have to go to bigger wheels to eliminate sidewall slop.

So if you go to the track you might want to throw some track tires on those "ugly" 18's you have, but for the street, the 20's are fine if you can keep out of the potholes.
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      07-23-2011, 06:43 AM   #12
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out of curiousity what would be the ideal tire pressure for running a Winter 240 Sottozero with 18s?


thanks in advance,
S

Quote:
Originally Posted by ben@tirerack View Post
Congratulations on your new M3. It does make sense to raise your pressures a little bit above the stock BMW recommendations due to your shorter sidewalls. Adding some air will protect the wheels more, and better support the weight of the vehicle. Max load bearing of a P Metric Standard load tire is 35 psi, which makes that solid starting point for your pressure settings. 26psi is definitely on the low side.

The hatred comes from the perception that 20" wheels are installed by those who are more concerned with image than performance. They are heavier, and the M3 tire sidewalls are already short enough that you do not have to go to bigger wheels to eliminate sidewall slop.

So if you go to the track you might want to throw some track tires on those "ugly" 18's you have, but for the street, the 20's are fine if you can keep out of the potholes.
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