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      12-23-2012, 01:59 AM   #23
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Quote:
Originally Posted by OuKEnFoLdMX


asi es paisano la cuidad de los baches y topes. yo las traigo en 36 adelante y 38 atras, probare con tus psi a ver como se siente. saludos
Compañero! Un gustazo saber que hay alguien mas por aqui en la forum. By the way, i have a couple of 225 run flats with less than 1000 km if you get yours damaged in those baches de mierda. I should warn you though, don't get your runflats lower than 32 or 33 psi or you will bite your sidewalls when you get to a pothole and basically destroy your tires on a single hiccup!
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      12-23-2012, 10:43 PM   #24
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Quote:
Originally Posted by Koer View Post
Interesting! i was always used to leave my tires at a low pressure and set them at a higher pressure on the weekends when i went out for a drive in the twisty mountains.

Now unfortunately the place where i live (Mexico City) has the worst street conditions you could imagine, so its a gamble; put your tires to the correct pressure and you will end up screwing up your steering and suspension due to the vibration and impacts of the low quality pavement. Lower your tire's Psi and you protect your suspension and steering, but certainly my tires are not going to last as long.

It all depends on the place you live. Some people are blessed with butter smooth streets and no potholes. Some are not that lucky.
I understand the need to protect your car from bad roads and impacts.
But, for that very reason you need to RAISE your cold tire pressures.
Running pressures too low, as you are doing, is actually increasing the risk of damaging your wheels, tires, and suspension, because you don't have enough tire pressure to maintain sidewall stiffness.
What you're doing is counter to what you want.
Raise the pressures to the minimum required as posted on the door sill, so that the added air volume will help absorb the energy from those bad roads.
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      12-23-2012, 10:44 PM   #25
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Quote:
Originally Posted by 7 4 7 View Post
I am regularly filling 32 psi all round, running on 18"ers style 397 wheels square setup on my F30 328i. I am getting decent performance with the current tyre pressures.

The reason to keep low tyre pressure is that in Mumbai, India the road quality is pathetic, sometimes the pot holes are almost the size of a crater. So keeping the tyre pressure lower than specified will help a bit in cushioning the ride quality & also not hampering the suspension as the tyre will absorb the bumps.

Can some one please elaborate on the pros & cons of keeping 32 psi all round / lower than company specified

Note : Running on 225/45 R18 Goodyear Excellence RFT setup
No. Counter intuitive.
Read my post above.
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      02-04-2013, 09:00 AM   #26
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Running on the following on my F30 328i

235/35ZP19" front
265/30ZP 19" Rear

How many psi am I looking @?

Thanks
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      04-13-2013, 01:55 AM   #27
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What are you guys running on 19"??
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      10-13-2015, 11:56 PM   #28
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Quote:
Originally Posted by Mikli View Post
What are you guys running on 19"??
As you see 0. Anyone that rides 19 have flats. (seriously, i'm wondering the same question, anyone?)
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      10-14-2015, 01:45 AM   #29
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i have 245-40-19 and 275-35-19 and had it at 35 front and 38 rear, but after tires warmed up, they typically increased to 38 and 41 and i felt the car was too stiff and would feel every bump. I have since reduced it to 32.5 and 35.5 (increases to abut 35.5 and 38.5) and have found it to be much more comfortable. but I'm not sure if its bad to be 2.5 psi under the recommended pressure

i live in texas though so temps can get pretty high
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      10-14-2015, 02:39 AM   #30
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I have OEM 18" on my 328i and damaged two 225/45 Pirelli RFTs with door's suggested psi.. Now i have non-RFTs and the tire guy suggests 40psi all around.. damn potholes..
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      10-14-2015, 01:44 PM   #31
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Hey guys ... Ur advice.


I live in Houston and the roads are shitty. I have a 328i with bmw 361 style wheels.

Front 225/35/20 pzero run flats with nitrogen
Read 255/30/20 pzero run flats with nitrogen

Below is a pic of my tires pressures and temperatures after about a 20 min drive.

Should i make any adjustments? Advice please
Attached Images
 
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      10-14-2015, 05:28 PM   #32
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Quote:
Originally Posted by Estoril1984 View Post
Something to do with how the car sits down under acceleration maybe?
I suspect it may have to do with the profile, the front tires have a higher profile than the back tires, I think the difference is 10mm usually, with the front having 10mm/2 =5mm more of an air cushion.

Bicycle tires are usually inflated to higher PSI and they have even less profile.

This also may tie into how higher profile on the front can absorb shocks better if you hit a pothole or curb, with a lower profile there might be more risk. The way they do it makes the front tires have 10mm more diameter than the rear which from aesthetics point of view shouldn't be proper. A more agressive stance would be achieved by the opposite.

Inflating the front to a lower pressure than rears makes it better able to handle potholes, and with the higher profile the pressure can be lower without running into isues.
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      10-14-2015, 08:50 PM   #33
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I run 33 and 35 cold on my non-RFT's. They get up to about 35ish in the front and 37ish in the rear when hot.
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      06-10-2016, 02:21 PM   #34
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I suffered a leak on the font passenger side, to compensate till I could fix it I increased the front pressure to 38 on both sides and rears were at 40. To my horror traction control light came on at 50mph.. and lost power beyond that, I have a 2013 xdrive btw.
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      10-10-2016, 03:10 PM   #35
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I've mostly kept tire pressure to 37-38 in all tires, that gives a decent efficiency bump from normal.

Lately, I shifted to 33 in front and 37 in rear, I like this combo better for curvy roads in SF bay, without losing on ride quality (since only front seats are occupied most of the time).
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      10-10-2016, 03:13 PM   #36
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Quote:
Originally Posted by mngobara View Post
Hey guys ... Ur advice.


I live in Houston and the roads are shitty. I have a 328i with bmw 361 style wheels.

Front 225/35/20 pzero run flats with nitrogen
Read 255/30/20 pzero run flats with nitrogen

Below is a pic of my tires pressures and temperatures after about a 20 min drive.

Should i make any adjustments? Advice please
That pressure is low, you might be causing extra wear. I recommend raising it by 2-3 psi on each.
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      11-11-2016, 06:48 PM   #37
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2013 F30 xDrive Tire Pressures

Thanks for everyone's input. I was originally running 32f, 38r on my 225-45-18 Bridgestone DriveGuard Run Flat tires, but felt that there was way too much understeer. I played around with different pressure settings and drove the mountain roads to Lake Arrowhead, CA several times. I found that 36f, 38r works the best for me. There's much less understeer and the car tracks much better in the corners.
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      11-29-2016, 04:51 PM   #38
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Hi, everyone is suggesting to go with the door's psi but where can i find it? which door?

thanks.
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      12-06-2016, 11:33 PM   #39
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Quote:
Originally Posted by rajan29 View Post
Hi, everyone is suggesting to go with the door's psi but where can i find it? which door?
Here in the USA the sticker is on the driver's/left side door jamb.
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      12-08-2016, 11:28 AM   #40
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Quote:
Originally Posted by John in VA View Post
Here in the USA the sticker is on the driver's/left side door jamb.
Thanks a lot
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      01-29-2017, 08:45 PM   #41
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Hi,

I have a 2014 sportline 335i with 225/45 R18 91Y tires

When I read my door sticker, I see that I should put 2.4 Bar all around (see attached picture)

But in this tread everybody is putting more on the rears, so my question is:

I'm reading the sticker correctly??
Attached Images
 

Last edited by jmordoj; 01-30-2017 at 04:00 PM.
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      02-02-2017, 03:15 PM   #42
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Quote:
Originally Posted by jmordoj View Post
Hi,

I have a 2014 sportline 335i with 225/45 R18 91Y tires

When I read my door sticker, I see that I should put 2.4 Bar all around (see attached picture)

But in this tread everybody is putting more on the rears, so my question is:

I'm reading the sticker correctly??
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      02-02-2017, 05:55 PM   #43
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Quote:
Originally Posted by 401FlaGATOR View Post
I suspect it may have to do with the profile, the front tires have a higher profile than the back tires, I think the difference is 10mm usually, with the front having 10mm/2 =5mm more of an air cushion.

Bicycle tires are usually inflated to higher PSI and they have even less profile.

This also may tie into how higher profile on the front can absorb shocks better if you hit a pothole or curb, with a lower profile there might be more risk. The way they do it makes the front tires have 10mm more diameter than the rear which from aesthetics point of view shouldn't be proper. A more agressive stance would be achieved by the opposite.

Inflating the front to a lower pressure than rears makes it better able to handle potholes, and with the higher profile the pressure can be lower without running into isues.
Realizing this post is very old, but as the thread has now been raised from the dead, M2/M3/M4 have 35 profile 19" tires front and rear (and 30 on 20s), M2 (245/265) calls for 32 all around while M3/M4 (255/275) call for 35 all around.

Clearly weight is the factor as the M3/M4 front 255 falls in between the M2 245/265.
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      05-31-2017, 09:36 PM   #44
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Quote:
Originally Posted by BimmerF30_335i View Post
i have 245-40-19 and 275-35-19 and had it at 35 front and 38 rear, but after tires warmed up, they typically increased to 38 and 41 and i felt the car was too stiff and would feel every bump. I have since reduced it to 32.5 and 35.5 (increases to abut 35.5 and 38.5) and have found it to be much more comfortable. but I'm not sure if its bad to be 2.5 psi under the recommended pressure

i live in texas though so temps can get pretty high
I almost arrived at the same figures on my new 235/40 19 and 275/35/19. Lowered to 32 front, and the car became really moody, and mushy. Very much so. Temps here, 13C, so 60? But my 335i M Perf is also 3690lbs, with Adaptive M tuned for hard 20" Pirellis. At 35F 38R I seem to have OK results. however, have yet to run them a really warm day pass 75F, just got them! But 32 front was surreally mushy.

Last edited by Musashi; 05-31-2017 at 10:06 PM.
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