sixgun95

I am thinking about a set of used rims for my 06' 911S Cabrio but I have no idea what I need, reading about offset, spacers, etc has me confused. I want an OEM sized replacement - what do I need?

rglbegl

http://acurazine.com/forums/tire_rim_calculator.php

sixgun95

This tells me nothing.

Taryon

In a general sense the lower the offset the more protruding the wheel is.
For example, a 19 inch diameter wheel with 11 inch width with a +50 offset will be 10mm more 'outwards' than a wheel of the same sizes but with +60 offset.

So the purpose of spacers (in this context) is to push the wheel out further. A 10mm spacer on a 19x11 +60 will result in an effective offset of +50.

Hope this helps reg offset and width

jhbrennan

Your owner's manual has a specific page in the back (technical specs?) that lists the OEM sizes for your car.

okbarnett

what you should do is decide what size tire you want to use, then find the wheel that will work with it. you have to know what the tire demensions are to know how big you can use on a car or if it will fit in your car

Comanche_699

First step is to decide if you want 19" or 20" wheels.

If you have some ideas of what you like, it would be easier to help guide you in the right direction. I was a total offset moron for years, and even though I'm far from a genius at it, I am happy with the understanding that The Lower the Offset, the more the wheels are pushed OUT, and the Higher the Offset the more the wheels are tucked IN to the fenders.

Assuming you want a flush look (the rims are pushed right out to the edge of the fender wells) you would probably want somewhere in the neighborhood of an ET51 offset for an 11" rear wheel, and ET56 on an 8.5" front wheel - just as a starting point.

I have a 2006 C2S Cab with Narrow Body Wheels - ET57 offset up front, and ET67 offset in the rear.

So I added a 7mm spacer to the front, and 15mm spacer to the rear, effectively changing the offsets to
ET50 front, and ET52 rear. Now the wheels are perfectly flush, and look perfect to me.

Hope that helps to explain it a little bit better?

Here are some photos to help illustrate:

BEFORE - ET57 FRONT ET67 REAR - notice how the wheels are tucked in to the fender wells:



AFTER: ET50 FRONT ET52 REAR (Spacers - 7mm Front, and 15mm Rear)



Others please calibrate me if I'm way off on this, but it is how I've come to understand offsets in the simplest terms.

rglbegl

It tells you EVERYTHING!!

If all you want to know is your current wheel size and offset, it is in your manual and on the wheels themselves.
Or, go here
http://lmgtfy.com/?q=porsche+997+stock+wheel+size

And remember, you can have any wheel re-barreled to any offset, so no need for spacers.