NON RFT tire pressure?

[Howiedds]

hey everyone, just wondering what tire pressure to run on NON-RFT tires (oem sized 20" TOYO PROXES STII). i tried using "oem rft specs" on the door and the tires looked flat.... and i started getting premature wear on the sides

right now im runnin 35psi front and back...is this ok? Usually just me and the wife (and she weighs under 99lbs)

[Naz24]

I think 37 is reasonable for the rear.

I'd keep fronts at 35 though.

[Howiedds]

Originally Posted by Naz24

I think 37 is reasonable for the rear.

I'd keep fronts at 35 though.

are you suggesting not to go lower or higher than 35 for the fronts? thanks -Howard

[motordavid]

Don't have your year's manual in front of me, but I would rec'd going with what the door jamb sticker says, normal load vs full load, unless you are running a car service or hauling gold bars.

Doesn't matter how the tires 'look'; if you use an accurate gauge on stone cold tires, the proper pressure is just that. And, some RFTs will have a slightly 'stiffer' sidewall vs non RFTs, and eyeballing a tire bulge is not the method.
GL, mD

[ard]

It really is rather simple-

Use whatever pressure gives you the ride, handling and wear you want- provided you stay under the labeled maximum. (and probably over the numbers BMW puts on the side of the door)

I have 5 cars, and a few other things with wheels, and I have no idea WHAT the manufacturer says to use for inflation!

OP- the observation that you will get excessive outer edge wear on the fronts due to the heavy front engine car plowing the tires around the turns is spot on- increase the pressure, you will get much less sideways roll. I use higher pressures in the front as compared to the rear, X5 and M5. The X5 has 37 in front 255/50-19 Mich RFTs

Again, as long as you are under the tire mfg max, you are free to experiment, IMO.

[Howiedds]

i did have it on the rec door jamb pressures, but i started to have abnormal tire wear on the outer tread. had these tires since week 2 of having my car, never drove it hard and havent even hit 4000 miles yet since sept.

[Howiedds]

Thanks ARD!

[DCC]

Originally Posted by Howiedds

hey everyone, just wondering what tire pressure to run on NON-RFT tires (oem sized 20" TOYO PROXES STII). i tried using "oem rft specs" on the door and the tires looked flat.... and i started getting premature wear on the sides

right now im runnin 35psi front and back...is this ok? Usually just me and the wife (and she weighs under 99lbs)

What does the door jam say the cold pressure should be...i would start from there.