I was thinking of getting some different wheels for my 1994 3.6 Turbo. Does anyone know the wheel offsets?

 

Stock:

Front: ET:52 8X18
Rear: ET:61 10X18

Mine:
I run rear ET: 54 for a more agressive look about flush with the rear fender rather than the factory being tucked in. RH wheels

I just order BBS racing wheels in offset 52 front and 54 rear.

Craig

 

Thanks. Where do you buy your wheels?

 

Wheel Enhancement is one place.

5-spoke 996 Carrera wheels fit nicely and are very lightweight though they are not period correct. They are easy to find used at less than $1K for the set.

 

So do any 8x 18 and 10 x 18 Porsche-type wheels fit our 965's as standard (I'm presuming same for 3.3 and 3.6)? For example turbo, GT3, sport-design alloys, and of course Speedlines....

 

RH wheels from RH http://www.rh-wheels.com/

BBS wheels froms BBS motorsport in Atlanta.

 

I am looking at some Speedline aliseo 3pc split rim wheels with highly polished outer rims, not lacquered.
Rear wheels 10j (ET 47). Front wheels 8.5j (ET 45). Measurement from rear of wheel that fastens to car, to face of rim is 95mm for the rear wheels and 76mm for the front wheels.

Tyres on rear wheels are 265/35/18ZR 93Y. Front tyres are 225/40/18ZR 88Y.

Will these fit my standard 3.3?

 

No, they will not. The front tires will stick two inches outside the fender. Rears will stick out beyond the fender as well. Max front offset would be about ET50 and rear I would no go much more than mine at ET54.

 

I am getting very confused here. Is it not possible to state simply which wheel sizes will fit my car, without going into offsets which are often not stated by the sellers and I don't understand either?

eg. Can we say that the max standard wheel size is 7.5 x 18" and 9 x 18" for example?

 

No...sorry offset is important. Let me see if I can give a simple explanation:

An offset of 0 means the mounting point, where the wheel contacts the hub, is exactly at the centerline of the wheel (half the wheel is inside the mounting point and half is outside). As you increase the offset, more of the wheel sits inside the mounting point.

Since our wheels have to fit inside the wheel well without rubbing, we need to use wheels with the proper offset.

You can not buy wheels based on width. Most Porsche OEM wheels have the offset stamped right by the valve stem.

These OEM Porsche wheels fit great

 

Thanks Jeffrey,
when you said "These OEM Porsche wheels fit great" which ones do you mean?

Finally, can you give me a range of acceptable offsets?

 

I have Kinesis 18x10.5" on the rears with 60mm offset and if i have to do it again i think i would go with 56 mm offset as it would be much closer to the fender lips..

 

Mark, with the front wheels it is very important to have the correct offset so you do not upset the geometry. On the rear of the car it is not so important for geometry on a 911 (as the back wheels stick out more than the fronts), but it still needs to be reasonable so as not to put too much strain on the wheel bearings.

The wheels on my 930 were custom made for the car.

I do have some mille miglia 993tt 17" replica's that I fitted to my 3.2 carrera, I believe they were for a 964. The wheels were measured and I bought the correct thickness wheel spacers / hub adapters that I was told to by the guys who did this for me. They actually build race cars.

BTW, IMO spacers look crap. I think that a 5mm shim or less is acceptable as it is not noticeable.

 

I agree Nathan. I will add that the offset in the rear depends in part on how you will drive the car. I was running a 65mm offset in the rear at the track (using those 996 wheels I show above, but they would occassionaly scrape one of the oil tubes in the right rear quarter panel. Using a 5mm spacer was just enough to center the wheel w/o touching any part of the fender.

I am guessing the situation is different with 10.5" wheels where 56mm may be a better choice. I just don't know if that wheel has enough clearence under hard cornering.

 

Does anyone know the common offset or stock offset of 993 or 996 turbos? Seems like ther are always a lot of great used deals on 996 wheels in various forums.