FlyYellow

i'm looking to run a 9" wide front 9x18et50 (i realize i will likely need to space it out) in the front of a 993 nb with a 245/35/18 tire. i do have about -2 degrees of neg. camber.

can anyone let me know if i can get it to fit (even with rolling the fenders).

Thanks,
Boris

ceboyd

Widest I was able to fit was 8.5" with spacers but that doesn't mean it isn't possible. I had to go with a 1/4" spacer at the time to prevent from rubbing on the inside spring but if the offset is correct from the start, I probably wouldn't have needed that spacer at the time.

I know I got a 17 x 8.5" to fit in front (off the rear of a boxster) FWIW

...but that 8.5" just BARELY fit.. a 9" probably would have rubbed on the inside AND fender (and my fenders ARE rolled)


...you MIGHT have to not only roll but PULL the fenders to pull that off!!!!

Flying Finn

Boris,

Do you have PSS-9 (or similar with smaller diameter spring) or stock suspension?

If you have stock, the larger diameter spring probably will create problems.

FlyYellow

i have a lowered car, with H&R springs. so i believe they are the wider springs....

Greg Fishman

I ran 9's on my race car with no issues. even ran 275 tires in the front at one point.

FlyYellow

Greg,

which offset on the 9's?

what suspension?

how much neg. camber?

Bill Verburg

These are front Speedline 9" ET50 w/225/40 x18

probably 235/40 and maybe 245/35 would work w/ some more work on the lips it would be very close

There is a full handthickness of room as is.

Ride height is ~24 1/4" f/24 5/8" r

FlyYellow

Bill do you have any spacers?

Bill Verburg

No spacers

Bill Verburg

I'd be very interested in knowing the details to get 275/? to fit. I can not imagine that.

I like the 235/275 combo on my older Carrera but it doesn't have much suspension adjustment.

I think that 235/ -245/ and 265/-275/ maqybe 285/ would work well.

Martin S.

Boris,

It is not so much the 9" wheel on the front, it is how big of a tire can you stuff in there...I believe with -2 degrees of camber, you could use a 245 on the front. Then you have to match the rolling radius up with your rear tire, about a 5% delta allowable. I have a spread sheet that calculates the rolling radius delta if you would like it...EXCEL of course.

Look at the progression in 17" tire sizes. With Hankook, my new pet tire, it is:
225 235 245 255 275

In 18", the selection is more limited: 225 265 285

For me...my ideal wheel and tire set up, that I know will fit and not turn off the ABS because of a rolling radius mis-match is: 225 40 18 on front and 285 30 18 rear...less than a 2% delta on the front to rear rolling radius.

If you want to run 9" and 11" wheels with monster tires, be prepared for 993 RSR body work...about $6,000 for this mod, according to my pal Kary who is contemplating doing just this.

According to Chris Cervelli, a knowledgable race car set up guy, the bigger the tires the better...more rubber on the road. And monster stif springs are recommended as well. Of course with this set up, you need a heavy duty suspension and monoballs, and the car will be a real bitch to drive on the street, if ever that is your intention.

Street cars are very difficult to convert to competitive track cars, when you are competing against dedicated track cars. By the time you get competitive, weight reductions, etc., you'll no longer have a street car. And lastly, I would never recommend converting a cabriolet to a heavy duty track car. There is just to much flex in the chassis, so I have been told.

Greg Fishman

No idea on the offset. JRZ's, close to negative 3 degrees.

ca993twin

Sorry for my ignorance, but is there any difference in the front fender/front geometry between a NB and WB? I thought they were the same... with the possible exception of a slightly different inner fender liner for the different front bumper cover.

I ask because I've seen some very wide tires on the front of WB cars (275). I use a 255x30x19, and am not close to rubbing (Ruf/Bilstein shocks/springs), and my fender lips are not rolled.

Greg Fishman

I wasn't the only one to do that. Problem was that I could get the car 10mm lower with the smaller tire and it made for a better balanced platform.
The 275's were credit card close to the fender and I ran 1000+lb springs, etc, etc.

Bill Verburg

That I understand and agree w/