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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > What about tire pressures on aftermarket rims/tires?



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      04-24-2008, 08:11 PM   #1
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What about tire pressures on aftermarket rims/tires?

Once you replace your stock rims/tires with aftermarket ones, what do you do about adjusting tire pressures? Do you still run the stock pressures? If you go plus one (19"), how does that affect the PSI you should be running? I am getting 19"s with TPMS installed. I know I will need to reset the sensors once they are installed, but how do I know at what pressure to inflate them?
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      04-24-2008, 08:17 PM   #2
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recommended tyre pressure can found on the tag at the side of driver's door.

normal load
front 2.4 bar
rear 2.6 bar
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      04-25-2008, 05:14 PM   #3
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Anyone?
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2013 AH3 F30 l EB2 l BLACK l ALUM l M-SPORT l PREM l TECH l COLD l DHP l S-AT l HK l 19" (ED 6/6/13)
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      04-25-2008, 05:45 PM   #4
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Sidewall of the tire will have max pressures usually and manufacturer website will often have some inflation guidelines.

Here's Goodyears take, So yeah, they recommend BMWs guidlines...

Quote:

How much air should I put in my tires?

Proper inflation is the single most important part of tire care. The inflation pressure on the side of the tire is the MAXIMUM operating pressure. It is not necessarily the right inflation for your vehicle. Always use the inflation recommended by the vehicle manufacturer. You can find it in your owner's manual, posted on the edge of the driver's door, on a door post or on the inside of the glovebox door. Always check inflation when tires are COLD: when the vehicle has been driven less than a mile or one hour or more after driving. Use a good quality tire gauge. Note: It's natural for radial tires to have a slight bulge in the sidewall at their proper inflation pressure. Check or adjust inflation every few weeks, before any long trip or if traveling with a heavy load. And don't forget to check the spare. Your Goodyear retailer can answer any questions you may have about tire inflation.
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      04-25-2008, 06:40 PM   #5
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I understand that, I was just wondering if adjustments should be made when you change the tire/wheel size from stock (like going from stock 18's to aftermarket 19's). Does that require a change of recommended pressures?
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      04-25-2008, 07:41 PM   #6
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No I wouldn't think so, though again I would check the sidewall just to make certain that the pressures you intend to run or are specified by BMW jive.
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      04-25-2008, 07:52 PM   #7
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I run 40 psi on my 19's. The higher preasure helps control the low profile sidewall a little better, and that in turn protects the outer rim a little better.
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      04-25-2008, 07:57 PM   #8
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Quote:
Originally Posted by Rips335iCoupe View Post
I run 40 psi on my 19's. The higher preasure helps control the low profile sidewall a little better, and that in turn protects the outer rim a little better.
Right, but how's the ride? BMW equips many of it's models with 19" wheels, I'd just bounce over to the M3 forum and ask someone there what PSI they are running. Should give you a general idea.

I understand the notion behind over inflating the tires to protect the wheels, but when performance and ride comfort are the goals??? I dunno, I'll be running whatever is on the door jamb. I ran it with my 19"DPEs with great success and great feel, so yeah.
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      04-25-2008, 09:02 PM   #9
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On my E93 I use 36/39 psi F/R as per door sticker recommendation for 19" wheels, even though I am using 235/275 non-RFT instead of 225/255 RFT as in OEM. I figure that such inflation pressure combination will result in the same contact patch sizes on all 4 tires as in OEM, just shaped differently because of the added width.
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      04-25-2008, 11:39 PM   #10
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      04-26-2008, 04:53 AM   #11
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Lightbulb

i just got my rims installed today
i didnt know what is the right pressure too!

right now i am running on 35/37 .. but looks like the factory 19" recommend 36/39 ??????

i dont wanna start another thread.. let's get an answer here.

please help.

i have Bridestone RE050A pole position
235/35/19 front 265/30/19 rear

thanks in advance!
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      04-26-2008, 06:20 AM   #12
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40psi won't help your wheel if you hit a pothole. Tried it. Had rim repaired anyway.
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      04-26-2008, 10:08 AM   #13
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Following the recommendations from BMW is okay but the recommendations are for the stock wheels, not aftermarket. After that you do your best.

I usually start at the recommended and then change from there.

It is not an exact science since there are always trade-offs and there is no perfect pressure.

Higher pressure might protect your tire better, but that is only might.

Go with the rec, setting and drive the car, adjust +-1 or 2 psi but keep it reasonable.
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      04-27-2008, 08:53 PM   #14
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sooo what should it be?!

im running 19/225 and 19/245

im going crazy on this issue and also on how to turn off that dam error code!

thanks!
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      04-27-2008, 11:42 PM   #15
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Well try the Air pressures specified in your door jamb. Then adjust to your preference as mentioned above.

Seriously, tire pressures are just about universal. Back in the 90s I was running 36-38 pounds with my old challenger. NOW I run near the same depending on load on a brand new BMW.

SO it's nothing new or revolutionary.
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      04-27-2008, 11:45 PM   #16
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does anyone know how to get that dam error code away!
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      04-28-2008, 12:10 AM   #17
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Quote:
Originally Posted by khoda355 View Post
does anyone know how to get that dam error code away!
Well specifying which code you are talking would help. I am assuming it's the TPMS warning right? If you have i-drive you just need to dig into the "Settings" menu and you'll find a spot there to reset TPMS.

Of you do not have Idrive.... I dunno. But you're owners manual should have the answers.
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      04-28-2008, 12:36 AM   #18
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38/42 here also for my 19"s runs great
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      04-28-2008, 12:40 AM   #19
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Quote:
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38/42 here also for my 19"s runs great
what size tires?
any problems at all?
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      04-28-2008, 08:45 AM   #20
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Question

Quote:
Originally Posted by Revlis View Post
Well specifying which code you are talking would help. I am assuming it's the TPMS warning right? If you have i-drive you just need to dig into the "Settings" menu and you'll find a spot there to reset TPMS.

Of you do not have Idrive.... I dunno. But you're owners manual should have the answers.
I getting my '08 328i AW delivered the first week in June and I'm about to buy 19" Beyern Mesh but before i do i want to know if it is an absolute necessity to buy the TPMS with them? My car will i i-drive and will i be able to disable the warning from constantly coming up? Or will just buying TPMS be the only way of preventing the warning from constantly popping up?
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      04-28-2008, 12:03 PM   #21
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Quote:
Originally Posted by kennethpetro View Post
I getting my '08 328i AW delivered the first week in June and I'm about to buy 19" Beyern Mesh but before i do i want to know if it is an absolute necessity to buy the TPMS with them? My car will i i-drive and will i be able to disable the warning from constantly coming up? Or will just buying TPMS be the only way of preventing the warning from constantly popping up?
Just buy the TPMS Sensors and have them installed. Otherwise yeah you are going to get constant tire pressure warnings.

TPMS is good stuff... Not a place to save a few bucks.
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      04-28-2008, 01:39 PM   #22
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Quote:
Originally Posted by Revlis View Post
Just buy the TPMS Sensors and have them installed. Otherwise yeah you are going to get constant tire pressure warnings.

TPMS is good stuff... Not a place to save a few bucks.
Thanks for the advice.

What if i buy the tires, TPMS & wheels seperate locations, Can i take them to any 'ol place to have them installed - mounted/balanced? Or would i have to take them to BMW?
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