[gmzanatta]

Originally Posted by mfritz

Have the same set up. What tire pressure are you using? Some say 35 psi all around, others 30 front 33 rear.

In addition to greatly improved traction they provide a smoother ride. My pss summer tires are done. Plan to go with new ps4 in the spring.

I experimented with it all last winter, but settled on 33 all around. 35 I found a bit much cause you want some more traction.

I tried the 30/32 thing and that was just too low.

[doug_999]

Originally Posted by ZPrime

That price is outrageous, especially given that you can't rotate that setup, which will basically cut the life of the tires in half.

Granted, they are OE BMW wheels... but they aren't forged, they are not really any different from any other higher-weight cast wheel built to TUV specs. You can find plenty of quality aftermarket wheels that meet these specs and don't cost what BMW wants to charge for cast wheels.

The difference is in the look

[hshot_rooke]

Originally Posted by gmzanatta

640M's w/ 235/40R18 and 255/35R18 Michelin Alpin 4's

Hi gmz, did you buy your winter set OEM from your BMW dealership? I'm wheel offset ignorant, but do the 640M's come in different offsets? Would you mind sharing your offset if you know?

Thanks in advance.

[gmzanatta]

Originally Posted by hshot_rooke

Hi gmz, did you buy your winter set OEM from your BMW dealership? I'm wheel offset ignorant, but do the 640M's come in different offsets? Would you mind sharing your offset if you know?

Thanks in advance.

Sorta...I negotiated them with the car.

No idea on the offsets to be honest, I never really bothered to check. Let me see if I can find out though.

[ZPrime]

Originally Posted by doug_999

The difference is in the look

Cars always look like shit in the winter, I see no need to try to keep up appearances when it's gonna be caked in salt and filth anyway.

Plus, for me, form follows function all day long.

[aassad1]

I have some left over 225/40r18 Blizzaks from my last BMW. If I got some 18x8 or 18x8.5 would they work? I'd prefer to not have to buy wheels and tires this year as I didn't plan ahead haha.

[hshot_rooke]

Originally Posted by gmzanatta

Sorta...I negotiated them with the car.

No idea on the offsets to be honest, I never really bothered to check. Let me see if I can find out though.

no worries, thanks!

[M3 Adjuster]

Originally Posted by gmzanatta

Sorta...I negotiated them with the car.

No idea on the offsets to be honest, I never really bothered to check. Let me see if I can find out though.

If your winter wheels are off the car it should be pretty easy to see the offsets. Yours should say 18J X ? And then ET ??. Most wheels have it stamped on the inside, a reasonably decent phone photo of the inside would probably do the trick.

[rich8566]

Originally Posted by hshot_rooke

no worries, thanks!

Offsets of 19" OEM Wheels:
29 front
40 rear

[rich8566]

I just did a set of 18x9 ET 40 wheels front and rear - aka square - with winter sport performance tires - Michelin PA4s in 245/40-18s all around. Clearance is tight at the front but there is no rubbing.

[gmzanatta]

Originally Posted by M3 Adjuster

If your winter wheels are off the car it should be pretty easy to see the offsets. Yours should say 18J X ? And then ET ??. Most wheels have it stamped on the inside, a reasonably decent phone photo of the inside would probably do the trick.

They were on the car before he asked the question and I'm away for work next two weeks....hopefully someone else who has the same set can chime in.

[JPizzz]

For those who’ve done both 18” and 19”, How much of a winter performance hit will I take using a 19” winter setup vs 18”? By performance I’m talking maintaining traction in wet/snow conditions. But usually nothing insane (live in Philadelphia area)

[gmzanatta]

Originally Posted by JPizzz

For those who’ve done both 18” and 19”, How much of a winter performance hit will I take using a 19” winter setup vs 18”? By performance I’m talking maintaining traction in wet/snow conditions. But usually nothing insane (live in Philadelphia area)

Enough that I think the 18's are justified if you're getting a winter only set.

But it depends on how often your car will see snow - if you mostly avoid it, 19's would be fine. If you're like me and drive in 10+ inches of the white stuff, 18's are the only way to go.

[ZPrime]

rubber will be cheaper and more available in 18" too.
In 19" all you can really find is "performance winter" tires which aren't as good in snow as a "Snow and ice" tire.

[Aronis]

Even with the winter shoes on the car, it's still a hoot! Running 245/40R18 Dunlop SP Winter Sport 3D's on BBS XA rims and had a little fun with a new Camaro SS. I thought those cars were supposed to be fast? I have snows, he had regular summer performance tires. Good thing they are rated to 149. LOL......

Mike

[Kid Eh]

I'm running an 18" square setup on Michelin PA4's. Have yet to see my first snow.

[CanadianDriver]

Running a square setup as well but 19x8.5s with Nokian Hakka R2s

[scadagawd]

Originally Posted by gmzanatta

640M's w/ 235/40R18 and 255/35R18 Michelin Alpin 4's

What tire pressures do you keep those PA4s at?

[rich8566]

Originally Posted by scadagawd

What tire pressures do you keep those PA4s at?

I run my square PA4 245/40/18s at 35 psi front and rear. That way when temps drop 15-20 degrees the pressures only go down to around 33 so I don't need to add air.