Chris M.

What further mods?

kgorman

I just got done putting 18x10 et65 with 265s and 18x8.5 et56 225s on my 964. I have almost 2' of negative camber.

The 'mods' that asbi is speaking of I believe are 17" wheel TSB 49106 (964.347.325.02) and a new 'flat' oil line (964.207.250.14). I ordered these parts as well, as soon as they arrive they are going on. Porsche does not recommend 18" wheels on the 964 except the turbo. Many people are running 18's anyways.

I am using a Porsche Motorsport 20mm spacer in the rear, and the factory lug bolt length. The factory length is a requirement in the rear. So the effective ET is 45. I just barely clear the oil line on the inside, and have just barely enough room on the outside. If I went for a 275 tire width, I am sure that would be the max.

I am using 5mm spacers from CDOC on the front, so the effective ET is 51. I am running 56mm lug bolts so I have fully engaged lug nuts. I recommend open steel lug nuts as well.

One important thing to note is I have 800lb springs in the rear (JIC Cross). This helps reduce any rubbing because of the stiffness. I had Bilstien/H&R greens before, and I had horrible rubbing issues on the track with 17x9 rims.

Hope this helps. Be prepared to purchase a bunch of different spacer sizes, and spend some time getting it just right.

Chris M.

Thanks for the reply Kenny. After much debate I've decided to stick with 17s. I checked today and my car already has the flattened oil line but I won't be running springs that stiff and don't want to deal with the spacers. I'll save the 18s for my next car...
Also, I'm running 7s and 9s X17 right now and don't have any rubbing issues at the track. This is probably due to my SUV ride height?

cobracarrera

I am going to ask a dumb question, but here it goes. If a person does not lower their 964 and they leave it at the stock height do they have a better chance of not having any clearance issues. I would really like to put the RH 18 inch wheels with 255/40/18 on the rear wheels on my stock riding 1990 C2. I do not want to lower the car at all, stock is fine for me..........I just want the wheels, exhaust, and wing put on my car.....Thats all. I always had my heart set on the RH wheels.....

Chris M.

It depends on the offsets but if they're correct you won't have any issues with that tire size. That's what I'm running on 17x9 rears and I have no problems, even at the track. But my 15 year old suspension is probably ready to be replaced and I'd like to rid my car of the SUV look at the same time.

kgorman

I think you can do that, but if you don't lower it it's going to look super 4x4-ish. It's worth it to deal with lowering it IMHO. RH wheels with RS ride height look AWESOME!

Gus

Ok - so it is the consensus of this aster body that 8 x 18 and 10 x 18 are the maximum width wheel sizes for the 964 narrow body. If you went with a 255 or a 275 on the 11 inch wheel would the tire width still be an issue. The cross sectional width of a 275 x 17 is 11 inch's and the cross sectional width for a 275 x 18 is 10.9 inch's. I guess my question is running a 275 on a 11 inch vs a 10 inch how much does this change the width of the tire at the cross section and farther out. At what point would the 275 on a 11 inch rim become close to the specs of a 275 on a 10 inch rim. ( disregards oil line rub as it is not in the stock location and is not a problem ) Car is lowered about an inch+ and running heavy spring with strong damper shocks settings - i.e. rides like an empty dump truck.

F2 Iceland

11'' with 295 tires
and two degrees camber




*edit* didn't see that this thread is six year old

TAI2

I ran 18x8.5 50mm and 18x10 50mm (no spacers) and my car was as low as Gary R.'s without any problem. I was planning to go to Hossiers from Toyo R888's and then because they are a bit wider I might have needed a 5 mm spacer in the rear to clear the oil line - no biggie.

Here is a picture of the wheels I had on my car which happen to be for sale. (I'm sorry for the shameless plug, I could not help myself). All are true, no curb rash, they just need to be re-clear coated. $900 +shipping.

Gus

F2 Iceland -
did you run spacers ?? what was your offset/ ET
TAI2 - sent PM, talk to me

sml

you obviously want to understand the issue & risks & calcs & clearances etc.

Suggest you read this ...

https://rennlist.com/forums/964-foru...el-offset.html

sml

can you translate this, or reword this please.

a 275 tyre is always 275 wide.

different width wheels are just pulling the bead in or out on the 275 tyre.

i have a 265 tyre on a 10" rim and the rim (and hence tyre bead) protrudes further than the tyre (so they are slightly 'stretched').

anyway please read link above

F2 Iceland

Those are oem 996tt hollow spokes and the offset is 45

no spacers