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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 pressure are you running in non-RFT tires



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      11-04-2014, 09:10 AM   #1
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What pressure are you running in non-RFT tires

running Conti DWS 245/35-19 front, 265/30-19 rear.

Any ideas on pressure? I contacted Continental and they gave me an unhelpful response the first time ("use the pressure on the door jamb unless you're running non factory sizes" when I clearly told them in my first contact that I was asking for a pressure/load chart because I was NOT running factory sizes) and then no response when I responded to their response.

thanks

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      11-04-2014, 09:16 AM   #2
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it says on the tire!

mine says 44 psi
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      11-04-2014, 10:12 AM   #3
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No, what is printed on the tire sidewall is maximum inflation pressure.

I'm looking for the recommended pressure vs. weight chart so I can weigh the corners of my car (or guess) and get a baseline before the tires wear too much.

If you inflate to max pressure your car will ride very hard, not handle as well as it should, and wear the tires in the center prematurely.
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      11-04-2014, 11:49 AM   #4
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30-35, at the track I usually go down to 27-28
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      11-04-2014, 02:01 PM   #5
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      11-04-2014, 06:18 PM   #6
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Go by the door jam sticker. This has been discussed before, and you should use the same pressure despite the tires being non run flat.
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      11-04-2014, 09:02 PM   #7
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Quote:
Originally Posted by Momukhamo View Post
it says on the tire!

mine says 44 psi
You've posted this a couple of times now. The pressure on the tire is a MAXIMUM pressure the tire can be inflated if under a very heavy load, NOT the RECOMMENDED tire pressure. My Conti Extreme Contact DWs say Maximum Inflation 51 psi. No one in their right mind would put 51 psi in their automobile tires for regular use, right?

Again, the BMW Owner's Manual that comes with the car has multiple pages on tire inflation recommendations based on tire size, driving speed, load carried, and whether the car has Sports Package or not.

And, as others have posted, you can use the plaque on the door jam IF it lists the tires you're using. Mine does not have a listing for 19" tires so I had to go to the manual. Yes...BMW recommends different pressure for 19" vs 17" and 18".

Here's the page from my manual...328i convertible with Sports package.

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      11-04-2014, 09:30 PM   #8
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35psi runs well, 37 to save a little gas
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      11-04-2014, 09:49 PM   #9
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Quote:
Originally Posted by Fitz335
30-35, at the track I usually go down to 27-28
Do yo mean 27-28 cold? Which probably brings them close to 38 hot?
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      11-05-2014, 11:49 AM   #10
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Quote:
Originally Posted by Isaiah5411
Quote:
Originally Posted by Momukhamo View Post
it says on the tire!

mine says 44 psi
You've posted this a couple of times now. The pressure on the tire is a MAXIMUM pressure the tire can be inflated if under a very heavy load, NOT the RECOMMENDED tire pressure. My Conti Extreme Contact DWs say Maximum Inflation 51 psi. No one in their right mind would put 51 psi in their automobile tires for regular use, right?

Again, the BMW Owner's Manual that comes with the car has multiple pages on tire inflation recommendations based on tire size, driving speed, load carried, and whether the car has Sports Package or not.

And, as others have posted, you can use the plaque on the door jam IF it lists the tires you're using. Mine does not have a listing for 19" tires so I had to go to the manual. Yes...BMW recommends different pressure for 19" vs 17" and 18".

Here's the page from my manual...328i convertible with Sports package.

right but the BMW recommendations are for RFTs in the factory sizes hence my question.

I do agree with the point you are making however.
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      11-05-2014, 12:34 PM   #11
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I run 38 front 41 rear michelin pilot as3's
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      11-05-2014, 03:52 PM   #12
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Quote:
Originally Posted by N8N View Post
right but the BMW recommendations are for RFTs in the factory sizes hence my question.

I do agree with the point you are making however.
I went back and looked at the manual. It does not specify that the pressures listed were for RFTs. Maybe that's implied since the later models come from the factory that way, but... It does say this, however:





But...did you guys know THIS??? The first sentence is contrary to everything said on TireRack about the benefits of tire rotation.
http://www.tirerack.com/tires/tirete...currentpage=56






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      11-05-2014, 04:23 PM   #13
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Rotating tires is for maximizing tread life, which for many people is a #1 priority, especially on non-performance cars. BMW seems to prioritize handing over tread life. Since BMW tires seem to wear more unevenly than other vehicles, it would make sense that rotating the tires could hurt handling.

With different size tires and uni-directional tires you can't rotate them anyways.
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      11-05-2014, 04:45 PM   #14
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Quote:
Originally Posted by ferocity02 View Post
Rotating tires is for maximizing tread life, which for many people is a #1 priority, especially on non-performance cars. BMW seems to prioritize handing over tread life. Since BMW tires seem to wear more unevenly than other vehicles, it would make sense that rotating the tires could hurt handling.

With different size tires and uni-directional tires you can't rotate them anyways.
I recently went to a square set up for a number of reasons, including gas mileage improvement (the 265s get about 2-3 less mpg than the 235's in my experience) and tire wear. My car was wearing the inside edge of my 265s (on 19x9.5) long before the tread life expired, giving me only 18-20k out of the rears. I'd typically go through 2 sets of rears for every set of fronts.

And the fronts were developing a little cupping on the outside edge, which, of course, can be helped by cross rotating.

I have Conti Extreme Contact DWs, which are a non-directional tire, so....

I really see no reason why I can't do the Rearward Cross or X-Pattern cross rotation described on the above TireRack link, especially if I do it at the recommended intervals of every 3-5,000 miles. Now...if one were to wait 'til the inside edge of the rears is down to the steel belts, it might not be a great idea to move THEM to the front.
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      11-05-2014, 05:43 PM   #15
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Quote:
Originally Posted by ferocity02 View Post
Rotating tires is for maximizing tread life, which for many people is a #1 priority, especially on non-performance cars. BMW seems to prioritize handing over tread life. Since BMW tires seem to wear more unevenly than other vehicles, it would make sense that rotating the tires could hurt handling.

With different size tires and uni-directional tires you can't rotate them anyways.
Eh I have staggered 161s on my e90 and I move them side to side every 5k miles. Keeps them quiet. If I don't my fronts start sounding really obnoxious due to "heel toe" wear on the edges. I don't really notice any adverse effects on handling, but I'm not driving at the limit.

They are asymmetric Potenza s04s non RFT.

Oh the topic, right... I run +2-3 over the door jamb typically. But in 2006 they had really low recommended inflation pressures. I think they were revised up in later years. (i.e. mine says 29/32 - later ZSP e90s 328i were more like 32/33 or 32/35 which is what I typically run).
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      11-06-2014, 08:42 PM   #16
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35-35, at 33-35 it would wear the shoulder a bit rapidly to my taste.
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      11-06-2014, 09:48 PM   #17
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Michelin Pilot Supersports 235/40 - 18 FR, 275/35 - 18 RR
37 psi FR 39 psi RR
Got 32K miles out of the Goodyear F1 Asymetrics I had previously on the fronts
SuperSports are fabulous tires
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      11-06-2014, 10:16 PM   #18
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Quote:
Originally Posted by CRG3 View Post
Michelin Pilot Supersports 235/40 - 18 FR, 275/35 - 18 RR
37 psi FR 39 psi RR
Got 32K miles out of the Goodyear F1 Asymetrics I had previously on the fronts
SuperSports are fabulous tires
Is this cold or hot?
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      11-07-2014, 01:23 PM   #19
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Quote:
Originally Posted by N8N View Post
No, what is printed on the tire sidewall is maximum inflation pressure.

I'm looking for the recommended pressure vs. weight chart so I can weigh the corners of my car (or guess) and get a baseline before the tires wear too much.

If you inflate to max pressure your car will ride very hard, not handle as well as it should, and wear the tires in the center prematurely.
Nate,

I run 35F/41R psi (cold) on my Michelin Pilot Super Sports, which is recommended for those times when you reach or exceed 100 mph. Since they are non-rft, the ride is absolutely velvety smooth. They are just +3 psi above the normal recommendation of 32F/38R psi on my door jamb. I like a firm, but not harsh ride, and I used the same specs on my previous set of DWS tires, with no harshness in the ride quality.

G/L on your decision, bro.
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      11-07-2014, 08:55 PM   #20
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Quote:
Originally Posted by Jsoboti View Post
Is this cold or hot?
These pressures are with the car having been undriven, sitting in my garage, regardless of the outside temperature

I have always tended to run higher pressures than most people, and the ride may be too firm for most, but I don't mind - one of the payoffs is that my tires, over the past couple of decades, have consistently worn evenly.

Technically, for tire pressures I think the reference point is an undriven tire at 40 F, or something like that.
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