[PhilG968]

Just a quick question.
Has anyone run 275 40 17 on the back of their 9 inch wheels and had any issue with rubbing.
I'm thinking about it, but wouldn't bother if there may be rubbing.

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[Fox944]

i was running 285/35 18's on 10 inch wheels with no rubbing. The car was lowered in the rear 3/4 inch (factory ride hieght adjustment). Now i'm running 265/35 18's.

shouldnt rub.

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[flash]

it's all about the offset, camber angle and brand of tire - i too am running a 285/30, but i had the rims built for my car, with specific offsets based on my setup

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[Fox944]

<!--quoteo(post=68420:date=Mar 12 2009, 04:31 PM:name=flash)-->QUOTE (flash @ Mar 12 2009, 04:31 PM) <{POST_SNAPBACK}><!--quotec-->it's all about the offset, camber angle and brand of tire - i too am running a 285/30, but i had the rims built for my car, with specific offsets based on my setup<!--QuoteEnd--><!--QuoteEEnd-->

agreed. Wheel offset is a big factor. My 285's were Michelin Pilot Sport's, the 265's are Michelin Pilot Cup's. Im assuming he is running OEM 17" wheels. I don't think a 275 tire will be a problem (could be wrong).

my '87 944 8V (which had MO30 suspension with the rear ride height lowered) rubbed with 225/30 Dunlop SP 9000's, due to the wheel offset. I had a set of BBS RS wheels on that car, cant recall the offset however.

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[flash]

also, a 275/40 is a tall tire, sucking up another .3" of wheel arch, so fitment gets tougher than on an 18 with a 285/30

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[Lemonlocators]

anything above the stock size for your wheel increase wheel weight dramaticaly. Depending on manufacturer of course, but I have seen as much as 10 pounds a tire in the size ranges we are talking. (rear).

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[flash]

yup - gotta make it up in super lightweight wheels

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[PhilG968]

Yes on factory 17s
I like the full look, but if they are likely to be a problem I could pass.
I'm thinking about the Max Perf Sumitomo HTR Z III

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[PorscheDude]

If you want a 275, you might consider 275/35.

I am getting ready to run 295/30/18 on an a 10.5" wide wheel. I should have just enough space.

If you want a 275, you might consider 275/35.

I am getting ready to run 295/30/18 on an a 10.5" wide wheel. I should have just enough space.

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[wmuldowney]

I have an oppertunity to get a set of Porsche wheels and tires but before I pull trigger here are the specs:

255/40zr 18
285/30zr 18

They are off of a 1997 993 C2s wide body

Any clearance issues? $550 for the set with 90% tread left on the tires.

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[flash]

the 255/40 will be a problem - the profile is pretty tall, making the outside diameter an inch larger

while a 255 can fit, whether or not it fits will be very dependent on the offset of the wheels and the brand of tire, as all tires differ in actual width versus indicated width

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[rhudeboye]

Your height doesn't concern me as much as your width. I'm running 18/40s in the front also. While mounting them I noticed that the rubber is right there at the front bottom corner of the fender. The wheel looks like its ready to touch. Will it rub in the turns? There's also that extra weight of a 255.

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[flash]

well, i have a 255 up front, on an 18, and it fits, and did so before i changed my spring diameter - however, i am running a 35 profile - that keeps the outside diameter down to the OEM of 25" - it was also VERY close both inside and out - i have to be very careful how much negative camber i used - the tire i used was a wide brand too, which did not help

for a 18" 255 in a 40 series to fit, it is going to be EXTREMELY critical that the offset be right, and you probably won't be able to lower the car or add any negative camber

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[rustech]

IIRC, the offset for the widebody 993/996 is way different than our cars. I really don't see any chance of them fitting.

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[Torbjorn968]

The typical setup in Sweden for 944/968 race cars are 265/35s on 18/9,5 rims forward and 295/30s on 18/11 rims at the rear.

I run 255/40/17 forward on 9" wheels with 47 ofset. I have an aquintance running 265s on 10" wheels forward with ET 54 (Edit: need to check ET but 10" forward is correct), this is tight however with the tyre rubbing the Torpedo wall at full lock. Camber in the case of my car is 3 degrees and the aquintance is running 4 degrees.

At the rear I use 10" rims ET 54 with 295/30s. Camber about 2 degrees. Visually there seems to be some extra room on the outside (maybee 1/5 of an inch) and about 2/3 inch on the inside.

//TL

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[wmuldowney]

OK I passed on the 18" setup, it was a good deal but would still need to change tires.
Also, Flash had me thinking about the weight and I think I will go with a 17" setup?

As always open to suggestions/recommendations

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[bob blackwell]

Phil, I am running the 275/40x17 Yokohama S Drive tires on the rear of "ol blue" and have had no problem with rubbing at all. There is a noticable loss in accelleration but I am expecting to get more wear from them than I did from the 255/40x15 that I had on the car. Gas mileage is also a little better. Good luck, Bob Blackwell.

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