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      01-03-2014, 10:26 AM   #1
petelazro
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tire pressure xdrive

I have read threads about tire pressure and looked at my door jamb and had a question.

I have 225/45/17 and 255/40/17 which says 32psi all around according to the user manual but it also says if you have 225/45/17 all around it says 32/35psi. why does staggared require less psi in the rear? but for the 19" staggared with 225/255 it says 35/41.

just wondering why the 17" staggared are 32 all around while the 19" staggared are 35/41?

what should i be running for my summer(225/255) and for my winters (225/225)?

does xdrive pressure have to be the same front to back?
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      01-03-2014, 12:43 PM   #2
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I have the 225 front 255 rear 18" setup for summer and I run 1 pound higher front and rear than the door suggests (33/34). Not really 100% sure how much it helps but it feels more responsive. I run the same psi front and rear on my 225/225 winters at about 32 psi (not 100% sure on that but I'll double check).
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      01-05-2014, 12:16 PM   #3
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ill try that out. thanks.
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      01-05-2014, 01:07 PM   #4
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Shorter stiffer sidewall needs more pressure on the 19", 17" are a taller sidewall overall softer tire.
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      01-06-2014, 12:35 AM   #5
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I just set mine a few minutes ago. We're expecting a cold snap to -20F tonight into tomorrow, so I wanted to check them in my garage instead off freezing my arse outside at some gas station, trying to bend their hardened airhose around. I used 32psi front/39psi rear. That's what the plaque says on my E92. I have 225/45-17 Continental Extreme Winter tires.
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      01-06-2014, 01:04 AM   #6
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Those pressures are for the tires that are affixed from the factory. You may be pushing it on those rears with that pressure. I would suggest dropping the rear psi down about 5 psi personally.
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      01-06-2014, 09:30 AM   #7
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i actually bumped up all my tire pressure to 36psi(warm) and the car handles better. less sluggish acceleration. I have 225/45/17 sottozeros.
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      01-06-2014, 06:28 PM   #8
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Set @ 36 PSI cold all the way around for my winter set up - Square 225/45/17 Dunlop Winter Sport 3D. Seems to be a good balance between comfortable and road feel.
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      01-07-2014, 05:56 PM   #9
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I had to set my set of Hankook Ventus V12 to 38psi square for them to behave. They were a much softer compound than my run-flats
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      01-07-2014, 06:00 PM   #10
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39 is too high, particularly if it's really cold out. As the temps in case, the air will expand and you'll be running more.
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      01-08-2014, 02:47 PM   #11
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Quote:
Originally Posted by AWD Addict
39 is too high, particularly if it's really cold out. As the temps in case, the air will expand and you'll be running more.
I'm with AWD Addict on the cold warning. At the end of my tires life I actually ran them higher at 40psi square (this past Sept. to Nov.) in order to have a smooth ride (not getting those tires again...). I assume it had to do with the low tread. However, my summers had a higher max than my RFT tires. Even on track days, though, they never went past 42 after a heat, still well within their max of 50. So I had to throw out the manual on these and just go by chalk tests since they were a totally different animal.

Currently, I'm running my non-RFT winters (Micheline X-Ice i3) at 36psi.

Side note: I almost threw them out after the first 2 months cause I thought they were defective. Took them too the dealer and they had me thinking it was cause they were non-RFTs and kindly offered me a set of new RFT for $1,200! Thankfully, I hungup and decided to do more research. After upping them from 32psi to 36 then finally 38psi, everything went smoothly for the rest of their life....20kmiles...I guess that's not too bad for high performance summers
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      01-08-2014, 04:25 PM   #12
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Conti DWS in OEM 18" sizes I run 38/38 cold. Have found out the hard way to run less risks rim damage around here. However I do not set those pressures at -30 deg F, and usually never set tire pressure while below freezing. If I happen to get a low pressure warning when it is super cold, I'll look at what all the other tires are at and go off that.
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      01-08-2014, 05:56 PM   #13
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Quote:
Originally Posted by ajsalida
Conti DWS in OEM 18" sizes I run 38/38 cold. Have found out the hard way to run less risks rim damage around here. However I do not set those pressures at -30 deg F, and usually never set tire pressure while below freezing. If I happen to get a low pressure warning when it is super cold, I'll look at what all the other tires are at and go off that.
How do you like those tires? I'm planning on getting them this spring
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      01-08-2014, 06:46 PM   #14
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Quote:
Originally Posted by ccraig13 View Post
How do you like those tires? I'm planning on getting them this spring
I like them a lot for my driving conditions. Year-round all season with good snow capability. They are not an autocross tire for sure but pretty good all around esp in winter conditions and great treadwear.

My req are a bit weird, up here in the mountains you need ice and snow capability 8-9 months of the year, but much or most of that time pavement is clear and dry. Plus you go from 5k ft ASL to 12k often, and go from summer to winter temps and road conditions in an hour. Destroys snow tires fast so finally I gave up on swapping out snow and summer tires, just went with these.

You def have to pay attention in the worst winter weather but not as scary as you'd think with the AWD. If I ever start doing track days again I'd get a square set of ARC8's and some sticky summer tires, but for street driving no need.
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      01-08-2014, 07:32 PM   #15
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Ha I was thinking about the ARC 8's as well! I like the look of the EC 7 bit more though. Luckily I have a few more months to decide

Actually I was wrong about the tires. I'm looking at the Conti ExtremeContact DW, which isn't an all-season.
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      01-08-2014, 07:50 PM   #16
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OK. Based on my experience with the DWS's if I ever get some summer tires it will be DW's.
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      01-09-2014, 08:09 AM   #17
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36psi square for me on my winters and summers (both 18s). Have even tire wear and no issues so far
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      01-12-2014, 03:34 PM   #18
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Quote:
Originally Posted by wdeerfield View Post
36psi square for me on my winters and summers (both 18s). Have even tire wear and no issues so far
^^ this. 35/36 about right for our wheel tire ranges. I lower blizzaks a bit in winter for softer tire/more grip and lower my v12s for racing in summer
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