Rims, Tires, Car, and PSI!

panzerfaust · 11-04-2011, 12:04 PM

Just wanted to start this thread to see what tire pressures people prefer and why. The first three items are for consideration when choosing a psi. Correct me if I'm wrong, but as far as I know:

Car is important for weight/balance (e90 vs. e92, 28 vs 35, i vs. xdrive).
Generally, larger diameter rims equal lower profile tires and require higher psi.
Tires matter in terms of profile and type (especially RFT vs non-RFT).

Currently my preference is:

e90 328XI
18x8 / 18x8.5 (F/R)
225/40 / 255/35 Conti DWS
38 / 40

Notes: I bumped up my PSI when moving away from RFT so I could maintain the "on rails" feeling. Although the higher psi, the DWS are still much more forgiving than the Bridgestone Potenzas.

flip4335 · 11-04-2011, 12:55 PM

Here are my specs, which I modified since swapping out RFTs for non-RFT tires.

I used the yellow sticker on my door jamb for speeds at or above 100mph, based upon OEM tire inflation recommendations:

Vehicle: e90 335i
Rims: 18x8.5 Front, 18x9.5 Rear - 219M Gunmetal
Tires: 235/40/18 Front, 265/35/18 Rear Hankook v12 non-RFT
PSI: 39 Front, 45 Rear Cold

11-04-2011, 12:04 PM	#1
panzerfaust Private First Class 23 Rep 133 Posts Drives: E90 328xi Join Date: Apr 2010 Location: Queens, NYC iTrader: (2)	Rims, Tires, Car, and PSI! Just wanted to start this thread to see what tire pressures people prefer and why. The first three items are for consideration when choosing a psi. Correct me if I'm wrong, but as far as I know: Car is important for weight/balance (e90 vs. e92, 28 vs 35, i vs. xdrive). Generally, larger diameter rims equal lower profile tires and require higher psi. Tires matter in terms of profile and type (especially RFT vs non-RFT). Currently my preference is: e90 328XI 18x8 / 18x8.5 (F/R) 225/40 / 255/35 Conti DWS 38 / 40 Notes: I bumped up my PSI when moving away from RFT so I could maintain the "on rails" feeling. Although the higher psi, the DWS are still much more forgiving than the Bridgestone Potenzas. __________________ 2008 E90 328xi \| M-tech Front \| 189s \| LCI Halogens \| PE
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11-04-2011, 12:55 PM	#2
flip4335 General Nuisance in a Private Conveyance 77 Rep 1,907 Posts Drives: like it's rented Join Date: Nov 2008 Location: behind the wheel iTrader: (1) Garage List 2007 BMW e90 335i [7.30]	Here are my specs, which I modified since swapping out RFTs for non-RFT tires. I used the yellow sticker on my door jamb for speeds at or above 100mph, based upon OEM tire inflation recommendations: Vehicle: e90 335i Rims: 18x8.5 Front, 18x9.5 Rear - 219M Gunmetal Tires: 235/40/18 Front, 265/35/18 Rear Hankook v12 non-RFT PSI: 39 Front, 45 Rear Cold __________________ BMWCCA Member # 414198 \|E90\|SGM\|6MT\|Premium\|Cold\|Sport\|Tint\|LCI MSport Conversion\|MTech\|Blacklines\|219M\|PSS\|Quaife\|Helix FMIC\|M3 Suspension\|Megan Racing\|GC Camber Plates/Coilovers\|Eibach 440/800#\|AR Catted DP\|Cobb AP\|StopTech Drilled/Slotted\|SS Brake Lines\|DWS Quaife Review: http://www.e90post.com/forums/showthread.php?t=311570
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