NOBY

I think you misstaken, even carnewal says et56 on front 8.5?

TheSpeedDemon

I am pretty sure, because I have researched running 18's on my NB for the track and was told the correct off-sets are as follows:

Front:
8.5x18 = 40mm
8.0x18 = 50mm

Rear:
11x18 = 63mm

I got these confirmed by people on this forum, but wait for others to chime in.

TheSpeedDemon

OK well I know what I am getting based upon factory wheels off-sets for my NB in which I will be using factory GT3 wheels with the offsets I listed.

GL with your research then and keep us posted

Ray S

GT3 offsets are:

Front 8.5 x 18 ET 45
Raer 11.0 x 18 ET 63

TheSpeedDemon

Thanks Ray. So 56 seems too much for a 8.5 on the front, do you agree ?

Besides I have never heard anyone running the same offsets for the front and rear on a Porsche.

Ray S

56 f, 56 r might work.........maaaybe (with the right tires) but it's really pushing it IMHO. I wouldn't put it on my car, that's for sure.

LVDell

Just clear up a few things.....

The GT3 wheels are:
8.5" et40
11" et 63

And now a little education on the offsets......
As the number gets SMALLER the FURTHER out they will protrude. The LARGER the number the further INWARD they will go.

NOBY.....it sound like you are trying to "fit a round peg into a square hole". Why are you not trying to find the proper sizes that will fit instead of asking a million different ways if the same wheels you are set on will fit. THEY WILL NOT FIT PROPERLY AND NO MATTER HOW MANY DIFFERENT WAYS YOU ASK THEY WILL NOT BE THE RIGHT WHEEL FOR YOU!!!!!

NOBY

Why do they sell this offset and say it will fit but realy not ? geeee...

I want bbs lemans

LVDell

Not sure why they do that other than to sell wheels NOBY......we went through this crap a year or two ago with the iForged wheels. The company REFUSES to give out the offsets but claim they are a perfect fit. Well guess what? They aren't. Who defines "perfect fit" in this case?

The benchmark you NEED to follow is finding an offset/wheel combo between the stock wheels and the GT3 wheels.

NOBY

Oh well guys, Ill take your words on this matter and skip the 11"

How wide tires can I go on 10" in the rear? Is it a big difference between 10" and 11" ?

Paul 996

Well using my "new math" your wheels would sit 2mm further in than what I am using now.

Now I am lowered and have -2.5 negative camber in the back and I don't run "fat" tires. 30 series on a 295-315 is the range that works back there for me.

Feel free to do your own math using http://www.1010tires.com/WheelOffsetCalculator.asp

Also, for the naysayers.. Porsche recommends an 18x10 ET 47 fittment for winter use on our cars and also advocates using a 17mm spacer with your stock 18x10 ET 65 changing the effective offset to ET 48.

NOBY's setup will be 4-5mm further out than what porsche recommends stock. As long as his car is lowered and is running more than 1.5 degrees negative camber and he doesn't do anything dumb like stick a 285/35 or 295/35 he should be good to go.

No flames please.

LVDell

If you don't have the camber and more importantly spring rate to hold the car then go on out as far as you want and just wait for the fender to pretend your tire is a turkey waiting to be carved on Thanksgiving

Benjamin Choi

BBS is kinda backwards with fitment. You'd think they'd have great fitment options for the 911, but they don't. It's actually quite sh!tty their fitment selection. Like they don't make a good fitment 12" rear for the widebodies.

And here in this case, same goes for 11s for the narrowbodies. It's messed up because they make awesome wheels and so perfect for the 911.

Ray S

On a 10" wheel a 285 is a perfect fit. You can go to a 295, but you'll be streching the bead a bit.

Ray S

Good catch, my bad.