Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - F01 / F02 (2009 - current)

7 Series - F01 / F02 (2009 - current)
The new re-designed 7 series F01 / F02 leads off the BMW Fxx chassis code!

Reply
 
Thread Tools Display Modes
  #1  
Old 02-22-2014, 01:11 PM
rsk rsk is offline
Officially Welcomed to the 'Fest
Location: Seattle
 
Join Date: Aug 2007
Posts: 135
Mein Auto: 325i
non-RFT tire pressure

Hi group

Swapped my RFTs to Bridgestone turanza serenity plus non-RFTs this morning.
The size is 245/50/18. My question is... should I inflate the non RFTs to the same tire pressure recommended by BMW for the RFTs.

Thanks for your help
rsk
Reply With Quote
Advertisement
  #2  
Old 02-22-2014, 02:07 PM
rajeek's Avatar
rajeek rajeek is offline
Officially Welcomed to the 'Fest
Location: ** last warning - tim330i **
 
Join Date: Jan 2013
Posts: 6,696
Mein Auto: ///M7
non-RFT tire pressure

Yes, if they are the same size.


Sent from your mom's iPhone
__________________

Options: Executive Package, M-Sport, B&O Sound, LED Lighting, Drivers Assist, Active Cruise. No RWS (Rear Wood Shelf).
Mods: BMS n63tu Tune, PedalBox, H&R Sport Springs, RD Sport Front Lip, Rear Roof & Trunk Spoilers, 20" Forgestar F14 Rims, Akebono Ceramic Brakes, 20% Front/15% Rear Tint, Carbon Fiber Wrap, Smoked Taillights, 760 Exhaust Tips, "Golf Tee" mod, Kidney Grills & Front Vents Painted Gloss Black, Brake Calipers Gloss Black w/BMW Logos, B&W Carbon Fiber Roundels.
Reply With Quote
  #3  
Old 02-22-2014, 02:14 PM
rsk rsk is offline
Officially Welcomed to the 'Fest
Location: Seattle
 
Join Date: Aug 2007
Posts: 135
Mein Auto: 325i
Quote:
Originally Posted by rajeek View Post
Yes, if they are the same size.


Sent from your mom's iPhone
Thanks Rajeek
Reply With Quote
  #4  
Old 02-24-2014, 12:34 AM
ajdoha234 ajdoha234 is online now
Officially Welcomed to the 'Fest
Location: Doha
 
Join Date: Jan 2013
Posts: 572
Mein Auto: 2013 740Li
Quote:
Originally Posted by rsk View Post
Thanks Rajeek
How do you like the ride difference?

Im really curious if the Non RTF's get rid of highway noise. My car seems louder than it shold be when Im cruising ( I usually hit around 110-120 mph) but I cant tell if its wind noise or tire noise.
Reply With Quote
  #5  
Old 02-24-2014, 02:32 AM
Leslierc's Avatar
Leslierc Leslierc is online now
Sejanus
Location: Silver Spring, Maryland - USA
 
Join Date: Sep 2006
Posts: 4,249
Mein Auto: From BMWs to Porsches
Please refer to this from Hankook Tires...

http://www.hankooktireusa.com/Serv/I...m=3&ChildNum=4

Though your non OEM tires may be the same size as your runflats, they are very different tires by design. Non-runflats perform differently, are less ridgid along the sidewall, and are usually much lighter in weight than runflats. Therefore, the correct inflation may be different in order to ensure that your tires' tread patch is correctly making contact with the road surface. I recommend doing a bit of research with the manufacturer to determine the proper inflation.
__________________
2013 Porsche Carrera 4
2011 Panamera 4S; 2012 Mini CooperS convertible;
Prior BMWs: `05 645CiC; `07 650i; `08 M6 convertible; '08 135i; `11 750ix MSport

"You think that's air you're breathing now?"
-Morpheus

Last edited by Leslierc; 02-24-2014 at 02:35 AM.
Reply With Quote
  #6  
Old 02-24-2014, 06:55 AM
rsk rsk is offline
Officially Welcomed to the 'Fest
Location: Seattle
 
Join Date: Aug 2007
Posts: 135
Mein Auto: 325i
Quote:
Originally Posted by ajdoha234 View Post
How do you like the ride difference?

Im really curious if the Non RTF's get rid of highway noise. My car seems louder than it shold be when Im cruising ( I usually hit around 110-120 mph) but I cant tell if its wind noise or tire noise.
The ride quality is so much better. Now it feels like a luxury car.
Road traction is very good. Breaking has improved.
I bought the car 6 months ago and I did not enjoy the car until I dumped the RFTs.
The downside, drive without a spare. I have AAA and BMW roadside assistance and I am counting on that.

Cheers
rsk

Last edited by rsk; 02-24-2014 at 07:27 AM.
Reply With Quote
  #7  
Old 02-24-2014, 07:25 AM
rsk rsk is offline
Officially Welcomed to the 'Fest
Location: Seattle
 
Join Date: Aug 2007
Posts: 135
Mein Auto: 325i
Quote:
Originally Posted by Leslierc View Post
Please refer to this from Hankook Tires...

http://www.hankooktireusa.com/Serv/I...m=3&ChildNum=4

Though your non OEM tires may be the same size as your runflats, they are very different tires by design. Non-runflats perform differently, are less ridgid along the sidewall, and are usually much lighter in weight than runflats. Therefore, the correct inflation may be different in order to ensure that your tires' tread patch is correctly making contact with the road surface. I recommend doing a bit of research with the manufacturer to determine the proper inflation.
I read quite few forum on this subject and there does not seem o be a consensus on whether the tire pressure must be the same for non RFT as RFTs. I am going to call the tire manufacturer and see what they say.

That brings me to another question, my OEM tires were 245/50/18 on all 4 wheels and the recommended tire pressure are F:32psi and R:35 psi.

My new tires are of the same size as well. since all the 4 tires are of the same size, should I still use the recommended staggered tire pressure for front and back or use 35psi on all the 4s.

Thanks
rsk
Reply With Quote
  #8  
Old 02-24-2014, 07:44 AM
Leslierc's Avatar
Leslierc Leslierc is online now
Sejanus
Location: Silver Spring, Maryland - USA
 
Join Date: Sep 2006
Posts: 4,249
Mein Auto: From BMWs to Porsches
Quote:
Originally Posted by rsk View Post
I read quite few forum on this subject and there does not seem o be a consensus on whether the tire pressure must be the same for non RFT as RFTs. I am going to call the tire manufacturer and see what they say.

That brings me to another question, my OEM tires were 245/50/18 on all 4 wheels and the recommended tire pressure are F:32psi and R:35 psi.

My new tires are of the same size as well. since all the 4 tires are of the same size, should I still use the recommended staggered tire pressure for front and back or use 35psi on all the 4s.

Thanks
rsk
You're saying that your non-OEMs are still stagered, yes? That's a good question. Off hand, I would say it's likely that it might still be differing pressures because of differences in size and weight-loads between the front and rear. This also would be a good question to pose to the manufacturer. It sounds like you're thinking in the right direction about this.
__________________
2013 Porsche Carrera 4
2011 Panamera 4S; 2012 Mini CooperS convertible;
Prior BMWs: `05 645CiC; `07 650i; `08 M6 convertible; '08 135i; `11 750ix MSport

"You think that's air you're breathing now?"
-Morpheus
Reply With Quote
  #9  
Old 02-24-2014, 08:05 AM
Leslierc's Avatar
Leslierc Leslierc is online now
Sejanus
Location: Silver Spring, Maryland - USA
 
Join Date: Sep 2006
Posts: 4,249
Mein Auto: From BMWs to Porsches
Quote:
Originally Posted by rsk View Post
The ride quality is so much better. Now it feels like a luxury car.
Road traction is very good. Breaking has improved.
I bought the car 6 months ago and I did not enjoy the car until I dumped the RFTs.
The downside, drive without a spare. I have AAA and BMW roadside assistance and I am counting on that.

Cheers
rsk
I once owned two SC430s that came with the dreadful Dunlop run flats. I switched from the runflats to Michelin Pilots on the first SC430 and had my salesman tranfer them to the second SC when I got that one. From that point onward, my Lexus SA advised all his customers to switch from the Dunlop run flats to the Pilots. As you describe, it was a much different and better performing car with the change of tires.
__________________
2013 Porsche Carrera 4
2011 Panamera 4S; 2012 Mini CooperS convertible;
Prior BMWs: `05 645CiC; `07 650i; `08 M6 convertible; '08 135i; `11 750ix MSport

"You think that's air you're breathing now?"
-Morpheus

Last edited by Leslierc; 02-24-2014 at 08:07 AM.
Reply With Quote
  #10  
Old 02-24-2014, 08:10 AM
rsk rsk is offline
Officially Welcomed to the 'Fest
Location: Seattle
 
Join Date: Aug 2007
Posts: 135
Mein Auto: 325i
Just spoke to the tire manufacturer and he said that I should use the recommendation from BMW and run 32psi in the front and 35psi in the back irrespective of whether RFT or non RFT.

For what it is worth, I filled Nitrogen in my tires to keep the pressure stable.

Thanks
rsk
Reply With Quote
  #11  
Old 02-24-2014, 08:20 AM
Leslierc's Avatar
Leslierc Leslierc is online now
Sejanus
Location: Silver Spring, Maryland - USA
 
Join Date: Sep 2006
Posts: 4,249
Mein Auto: From BMWs to Porsches
Quote:
Originally Posted by rsk View Post
Just spoke to the tire manufacturer and he said that I should use the recommendation from BMW and run 32psi in the front and 35psi in the back irrespective of whether RFT or non RFT.

For what it is worth, I filled Nitrogen in my tires to keep the pressure stable.

Thanks
rsk
Cool! Let me know how the nitrogen works for you. I'd be interested in how the tires behave with driving under different weather (temperature) conditions. I often check the psi on the tires on my Panamera and 991...the system actually communicates the pressure on each tire...and it's amazing how quickly the temperatures fluxuate under driving when the tires start out cold.

Thanks!
__________________
2013 Porsche Carrera 4
2011 Panamera 4S; 2012 Mini CooperS convertible;
Prior BMWs: `05 645CiC; `07 650i; `08 M6 convertible; '08 135i; `11 750ix MSport

"You think that's air you're breathing now?"
-Morpheus
Reply With Quote
  #12  
Old 02-24-2014, 09:47 AM
PREDATOR 007's Avatar
PREDATOR 007 PREDATOR 007 is online now
Officially Welcomed to the 'Fest
Location: ** Removed **
 
Join Date: May 2012
Posts: 4,413
Mein Auto: 2013 750Li
Quote:
Originally Posted by Leslierc View Post
Cool! Let me know how the nitrogen works for you. I'd be interested in how the tires behave with driving under different weather (temperature) conditions. I often check the psi on the tires on my Panamera and 991...the system actually communicates the pressure on each tire...and it's amazing how quickly the temperatures fluxuate under driving when the tires start out cold.

Thanks!
Ain't that the truth. We headed out to church yesterday morning and warning light came on and said my back passenger tire was 31lbs. A few hours later, I go out to show a few homes and the light never came back on.
__________________
** Removed ** 19,000th, 22,000th, 22,222th, 26,000th, 35,000th, 45,000th & 48,000th post in http://www.bimmerfest.com/forums/sho...39113&page=912
WR 12.63 @ 111.14 MPH

Quote:
Originally Posted by bighorns View Post
Go someplace that sells essential oils and get some lavender. Put a couple drops on your wrists and smell it when you feel anxious. It works!
Reply With Quote
  #13  
Old 02-24-2014, 10:38 AM
AdamG13 AdamG13 is offline
Officially Welcomed to the 'Fest
Location: Los Angeles, CA / Hillsboro Beach, FL
 
Join Date: Mar 2010
Posts: 1,133
Mein Auto: 2013 750i
I've always run my tires on the high side when it comes to air pressure. My last 7 still had lots of tread left when I traded the lease in. Currently with the M sport 20's I keep em at around 42 rear 39 front
__________________

2013 750i Mineral White
Previous Bimmers:
2011 750i Jet Black
2007 750i Monaco Blue
Reply With Quote
  #14  
Old 02-25-2014, 07:10 AM
bruno787 bruno787 is offline
Officially Welcomed to the 'Fest
Location: Philippines
 
Join Date: Sep 2009
Posts: 530
Mein Auto: 740Li (F02)
Quote:
Originally Posted by AdamG13 View Post
I've always run my tires on the high side when it comes to air pressure. My last 7 still had lots of tread left when I traded the lease in. Currently with the M sport 20's I keep em at around 42 rear 39 front
isnt that dangerous? overinflated tires have less traction
__________________
10 740Li
11 Mini John Cooper Works
12 Range Rover Evoque Dynamic Si4
Reply With Quote
  #15  
Old 02-25-2014, 09:29 AM
gassy gassy is offline
BMW 7 Series Obsessed
Location: Georgia
 
Join Date: May 2005
Posts: 315
Mein Auto: 2011 750i Milano Beige
I run 38 rear/36 front on Conti Extreme Contacts non-RFTs. This is the best compromise between ride and tread wear for me.
__________________
2011 750i/ Milano Beige/ Saddle & Black Nappa/
Reply With Quote
  #16  
Old 02-25-2014, 09:38 AM
chrischeung chrischeung is offline
Officially Welcomed to the 'Fest
Location: Dallas, TX
 
Join Date: Sep 2002
Posts: 7,447
Mein Auto: 2012 ActiveHybrid 7 SWB
It's air that supports the car, not the tires. So it make sense that the amount of air be the same. The rigidity of the RFT comes into play as support when there is a lack air, not at correct pressure, when the car is stationary.
__________________
2012 ActiveHybrid 750i ED

3/12 ED 7 - thread ID 610350
1/11 ED 6 - thread ID 5767556&postcount=175
4/10 ED 5 - thread ID 453501
5/08 ED 4 - thread ID 290679
3/07 ED 3 - thread ID 201013
3/06 ED 2 - thread ID 136454

Last edited by chrischeung; 02-25-2014 at 09:39 AM.
Reply With Quote
  #17  
Old 02-25-2014, 09:51 AM
Leslierc's Avatar
Leslierc Leslierc is online now
Sejanus
Location: Silver Spring, Maryland - USA
 
Join Date: Sep 2006
Posts: 4,249
Mein Auto: From BMWs to Porsches
Quote:
Originally Posted by chrischeung View Post
It's air that supports the car, not the tires. So it make sense that the amount of air be the same. The rigidity of the RFT comes into play as support when there is a lack air, not at correct pressure, when the car is stationary.
Interesting. So, what about this? I know that for non-runflats one can adjust the air pressure to effectuate ride and handling aspects. Performance tires specifically allow for this. For example, reducing the air pressure in a non-runflat will result in a tire wearing quicker but providing increased grip. The reason I didn't think that's possible for runflats is because a reduction in air pressure could compromise the integrity of the sidewalls.
__________________
2013 Porsche Carrera 4
2011 Panamera 4S; 2012 Mini CooperS convertible;
Prior BMWs: `05 645CiC; `07 650i; `08 M6 convertible; '08 135i; `11 750ix MSport

"You think that's air you're breathing now?"
-Morpheus
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - F01 / F02 (2009 - current)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 03:18 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms