Tire Pressure with replacements

ScotsWhaHaeWi · 03-08-2019, 10:22 PM

I got my 40i with 20" RF and the spare tire option with the plan to change to NRF soon. The door plate tire pressures for the supplied Bridgestone Alenza RF are quite a bit higher than I'm used to seeing.

I'm wondering if the pressure recommendation will stay the same if I put, say, Michelin Sport non RF on? Anyone have insight?

AndroidRobot · 03-08-2019, 10:32 PM

Quote:

Originally Posted by ScotsWhaHaeWi

I got my 40i with 20" RF and the spare tire option with the plan to change to NRF soon. The door plate tire pressures for the supplied Bridgestone Alenza RF are quite a bit higher than I'm used to seeing.

I'm wondering if the pressure recommendation will stay the same if I put, say, Michelin Sport non RF on? Anyone have insight?

I go off iDrive usually. The door plate isn't wrong, you should run those pressures at a minimum unless otherwise noted. Best way to confirm is to have someone with 20" Non-RFTs post their door tag

wrickem · 03-09-2019, 04:47 AM

That's funny, I've also got 20" with Bridgestones and I thought the recommended pressure was much lower than I'd expect for a large tire on a heavy vehicle.

mattsrs · 03-09-2019, 07:06 AM

Quote:

Originally Posted by ScotsWhaHaeWi

I got my 40i with 20" RF and the spare tire option with the plan to change to NRF soon. The door plate tire pressures for the supplied Bridgestone Alenza RF are quite a bit higher than I'm used to seeing.

I'm wondering if the pressure recommendation will stay the same if I put, say, Michelin Sport non RF on? Anyone have insight?

Can you exchange the RFs with NRF? I want to do that but don't want to spend one whole new set of tires when RFs are new. Is it common for tire shops to do exchange?

sygazelle · 03-10-2019, 03:44 AM

Quote:

Originally Posted by ScotsWhaHaeWi

I got my 40i with 20" RF and the spare tire option with the plan to change to NRF soon. The door plate tire pressures for the supplied Bridgestone Alenza RF are quite a bit higher than I'm used to seeing.

I'm wondering if the pressure recommendation will stay the same if I put, say, Michelin Sport non RF on? Anyone have insight?

I thought I would be getting rid of run craps as soon as possible too but I can't believe I'm saying this...the Bridgestone 20"s are not horrible. Yes, I will want go flats when its time to change, but I'm happy to wait until the OEM tires wear out first.

Mark609 · 03-10-2019, 07:22 AM

Quote:

Originally Posted by sygazelle

I thought I would be getting rid of run craps as soon as possible too but I can't believe I'm saying this...the Bridgestone 20"s are not horrible. Yes, I will want go flats when its time to change, but I'm happy to wait until the OEM tires wear out first.

My 19" are comfortable and handle really well. I'll probably switch to regular tires as soon as these wear out and if I have a flat will call roadside assistance.

Regarding PSI - No matter the tire or vehicle I've always used the Max. pressure rating as stated on the sidewall as a guide and pressurized them at or just below Max. Wear has been great. I recently changed from 44 PSI front/back based on the door sticker to 33 fronts, 44 rears.

Can't tell much difference.

Here's the kicker....with the weight of the engine being borne by the front tires, why would the factory recommend they be less than the rears?

rmorin1249 · 03-10-2019, 07:44 AM

I have the 20" Pirellis and I believe the door plate says to run 36 Front and 41 Rear. This is higher than I am used to but this is the first BMW SAV I have owned.

mattsrs · 03-10-2019, 07:48 AM

Quote:

Originally Posted by Mark609

My 19" are comfortable and handle really well. I'll probably switch to regular tires as soon as these wear out and if I have a flat will call roadside assistance.

Regarding PSI - No matter the tire or vehicle I've always used the Max. pressure rating as stated on the sidewall as a guide and pressurized them at or just below Max. Wear has been great. I recently changed from 44 PSI front/back based on the door sticker to 33 fronts, 44 rears.

Can't tell much difference.

Here's the kicker....with the weight of the engine being borne by the front tires, why would the factory recommend they be less than the rears?

Do you have spare tire package? I'm thinking about replacing RFs with regular as well but like to have spare in that case. I didn't order the spare package and my CA says I cannot fit spare in trunk as the molding of compartment under trunk cover is different (than with spare package) so it won't fit

Mark609 · 03-10-2019, 08:25 AM

Quote:

Originally Posted by mattsrs

Do you have spare tire package? I'm thinking about replacing RFs with regular as well but like to have spare in that case. I didn't order the spare package and my CA says I cannot fit spare in trunk as the molding of compartment under trunk cover is different (than with spare package) so it won't fit

No. I tried to add it before production but the VIN had been assigned. Now if I want it I have to pay like $500 is a rip. I've come to the conclusion that since we have roadside assistance it's a big waste of money and space. There's a lot of useful storage space in that area.

I believe your CA is right as mine advised me that on some BMW's the spare will raise the deck it's under.

Just get your regular tires come time and a can or two of a tire sealant for emergencies or enroll in AAA roadside assistance after the 4 yr. BMW term.

rmorin1249 · 03-10-2019, 09:09 AM

Quote:

Originally Posted by Mark609

My 19" are comfortable and handle really well. I'll probably switch to regular tires as soon as these wear out and if I have a flat will call roadside assistance.

Regarding PSI - No matter the tire or vehicle I've always used the Max. pressure rating as stated on the sidewall as a guide and pressurized them at or just below Max. Wear has been great. I recently changed from 44 PSI front/back based on the door sticker to 33 fronts, 44 rears.

Can't tell much difference.

Here's the kicker....with the weight of the engine being borne by the front tires, why would the factory recommend they be less than the rears?

Pretty sure the higher recommended PSI in the rear is to account for max luggage weight. Also running lower PSI in the front encourages understeer to avoid the rear end kicking out but this is rare with all the nannies turned on.

ted99 · 03-10-2019, 10:46 AM

After changing out my RF's on a 2015 528i after a 1000 miles to non RF's because of their non-compliant ride, I also was pleasantly surprised by the RF's on my 2018 X5 40e with 19" tires. I decided to keep them. However, I'm accustomed to getting at least 40,000 miles from non-RF tires on past autos and I am not impressed by the wear on these RF's. It looks like I'll struggle to get 30,000 miles. At 10,000 miles, I had 2 mm more wear on the rears, than fronts; so I rotated the tires. Door plate pressures maintained at all times.

Mark609 · 03-10-2019, 03:43 PM

Yeah, I usually get 60K miles on go flats.

03-08-2019, 10:22 PM	#1
ScotsWhaHaeWi Private 51 Rep 63 Posts Drives: 2019 X5 40i Join Date: Nov 2018 Location: Tx iTrader: (0)	Tire Pressure with replacements I got my 40i with 20" RF and the spare tire option with the plan to change to NRF soon. The door plate tire pressures for the supplied Bridgestone Alenza RF are quite a bit higher than I'm used to seeing. I'm wondering if the pressure recommendation will stay the same if I put, say, Michelin Sport non RF on? Anyone have insight?
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03-09-2019, 04:47 AM	#3
wrickem Big Beaver Smile 2101 Rep 3,791 Posts Drives: What he wants to Join Date: Mar 2006 Location: lambertville nj iTrader: (0)	That's funny, I've also got 20" with Bridgestones and I thought the recommended pressure was much lower than I'd expect for a large tire on a heavy vehicle. __________________ ______________________________________________ Current- '21 430 , '19 911, 07 M6 ,'17 Jeep Wrangler, "23 Bronco OBXluxsquatch
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03-10-2019, 07:44 AM	#7
rmorin1249 Lieutenant Colonel 817 Rep 1,785 Posts Drives: 2019 X5 MSport 40i Join Date: Jan 2019 Location: Hagerstown MD iTrader: (0)	I have the 20" Pirellis and I believe the door plate says to run 36 Front and 41 Rear. This is higher than I am used to but this is the first BMW SAV I have owned. __________________ COL(Ret), US Army Hagerstown MD 2019 X5 40i MSport Alpine White/Coffee (my 13th BMW) 2015 Mercedes SL400; 2009 Lexus RX350
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03-10-2019, 10:46 AM	#11
ted99 Lieutenant 242 Rep 535 Posts Drives: former i3>330e, 528i>X5>530e Join Date: Jan 2015 Location: Houston, TX iTrader: (0)	After changing out my RF's on a 2015 528i after a 1000 miles to non RF's because of their non-compliant ride, I also was pleasantly surprised by the RF's on my 2018 X5 40e with 19" tires. I decided to keep them. However, I'm accustomed to getting at least 40,000 miles from non-RF tires on past autos and I am not impressed by the wear on these RF's. It looks like I'll struggle to get 30,000 miles. At 10,000 miles, I had 2 mm more wear on the rears, than fronts; so I rotated the tires. Door plate pressures maintained at all times.
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03-10-2019, 03:43 PM	#12
Mark609 Banned 167 Rep 405 Posts Drives: 2019 G05 Xline Join Date: Dec 2018 Location: Central Texas iTrader: (0)	Yeah, I usually get 60K miles on go flats.
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