New Wheels/Tires Sizes, what about PSI?

Hooy · 03-23-2011, 11:32 PM

I went from 17x8 w/ 225/45 tires using the recommended 32/35 psi, but now am on

18x8 & 18x8.5 w/ 235/40 and 265/35 tires. How should my tire pressure be set for daily road use?

Also asking because my buddy is going from 16x7 wheels to 18x8 square. Tires grew from 205/45 to 225/40.

Thanks guys!

kanecvl · 03-23-2011, 11:37 PM

32-35 should be good. the specs call for that amount i too. I think it calls for 32. look in the door jam

Hooy · 03-23-2011, 11:44 PM

Quote:

Originally Posted by kanecvl

32-35 should be good. the specs call for that amount i too. I think it calls for 32. look in the door jam

Awesome coupe! NT05 here too!

1QuikWS6 · 03-24-2011, 03:24 AM

Normal tires pressures would be the same regardless of tire size.

If you're moving from RFT's to non-RFT's, you will notice slight difference in how car handles due to the more flexible sidewalls of the non-RFT's over the RFT's. To get back most of that feel, you can add 3psi or so above recommended pressures...

kanecvl · 03-24-2011, 07:32 AM

Quote:

Originally Posted by Hooy

Awesome coupe! NT05 here too!

Thanks!! I like them but they are too soft. I'm down to the wear bar in about 8k miles.

John_01 · 03-24-2011, 07:42 AM

Quote:

Originally Posted by 1QuikWS6

If you're moving from RFT's to non-RFT's, you will notice slight difference in how car handles due to the more flexible sidewalls of the non-RFT's over the RFT's. To get back most of that feel, you can add 3psi or so above recommended pressures...

+1. Stock pressure are a bit low as they are inteded for RFT.

Hooy · 03-24-2011, 10:49 AM

Quote:

Originally Posted by John_01

+1. Stock pressure are a bit low as they are inteded for RFT.

Hm... should I up the PSI by... say, 2-3 all around? The last thing I want is over or under inflation and uneven wear.

VMRWheels · 03-24-2011, 01:30 PM

I generally recommend anywhere from about 35-38 PSI depending on weather and driving conditions.

-Charles@VMRWheels

John_01 · 03-24-2011, 04:54 PM

Quote:

Originally Posted by Hooy

Hm... should I up the PSI by... say, 2-3 all around? The last thing I want is over or under inflation and uneven wear.

I like 35-36 for the fronts and around 38PSI for the rears.

03-23-2011, 11:32 PM	#1
Hooy Colonel 205 Rep 2,770 Posts Drives: E92 328i, E92 M3 Join Date: Sep 2009 Location: Houston, TX iTrader: (12) Garage List 2008 E92 328 [5.00]	New Wheels/Tires Sizes, what about PSI? I went from 17x8 w/ 225/45 tires using the recommended 32/35 psi, but now am on 18x8 & 18x8.5 w/ 235/40 and 265/35 tires. How should my tire pressure be set for daily road use? Also asking because my buddy is going from 16x7 wheels to 18x8 square. Tires grew from 205/45 to 225/40. Thanks guys!
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03-23-2011, 11:37 PM	#2
kanecvl Lieutenant 22 Rep 586 Posts Drives: 15 535d Join Date: Aug 2009 Location: NC iTrader: (6)	32-35 should be good. the specs call for that amount i too. I think it calls for 32. look in the door jam __________________
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03-24-2011, 03:24 AM	#4
1QuikWS6 No 55mph 1622 Rep 8,476 Posts Drives: F32 435ix MSport Join Date: Jul 2009 Location: Blitzburgh, PA iTrader: (113) Garage List 2022 BMW M440ix Vert [0.00] 2015 BMW 435ix MSport [0.00] 2000 Pontiac Trans Am [0.00]	Normal tires pressures would be the same regardless of tire size. If you're moving from RFT's to non-RFT's, you will notice slight difference in how car handles due to the more flexible sidewalls of the non-RFT's over the RFT's. To get back most of that feel, you can add 3psi or so above recommended pressures... __________________ F32 435ix//MGM//M Sport-Prem-Tech-Driver Assist-Lighting-Cold Weather-Dyn Handling Pkgs//M4 Black Lthr Int w/M4 Alum Blade Trim//HK w/Bavsound Stg3//763M//M4 Euro LCI Tails//M4 Mirrors w/CF Covers//AWCarbon CF F/R Spoilers-Side Splitters-Diffuser 6WB/ID6 HU+HUD/IND M4 Alcantara Armrest//PURE S2 Turbo//AA FMIC+DP//ER CP+TIC//3.5bar TMAP/TS DV//AWE Tuning Exh w/Blk Tips//Turner MS CF Intake//BM3 Cary Jordan Tune//MPerf Diff//PrecRW Ignition Kit
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03-24-2011, 01:30 PM	#8
VMRWheels BimmerPost Supporting Vendor 2042 Rep 25,989 Posts Drives: BMW Join Date: Jun 2007 Location: Anaheim, CA iTrader: (4) Garage List 2013 BMW M3 [10.00] 2015 BMW M4 [0.00] 2013 BMW F30 [0.00] 2014 BMW F22 [0.00] 2013 BMW F06 [0.00]	I generally recommend anywhere from about 35-38 PSI depending on weather and driving conditions. -Charles@VMRWheels __________________ VMR\|Wheels \| 714.442.7916 \| sales@velocitymotoring.com \| www.velocitymotoring.com \| facebook \| flickr \| Instagram
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