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tire size for C4S

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Old 10-09-2011, 05:22 PM
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tire size for C4S

hey guys,

i recently just purchased some wheels for my car and since its AWD i would like to know some of the tires sizes people are running so i dont mess up my differentials. I would also like to run some pretty aggressive tires like RT615's DZ101 star specs, any type of R-comp really.

the wheel specs are 19X8.5 and 19X11

any help is much appreciated,


thanks
siam
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Old 10-09-2011, 07:54 PM
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19" wheels/tires aren't recommended by Porsche for the C4S, so it's hard to say what might happen to your differentials.
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Old 10-09-2011, 08:51 PM
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Given OEM is Front: 225/40R18; Rear: 295/30R18. And, OEM wheel diameter is: 25.08 F; 24.96 R. I would go with: F 245/30R19 (24.78 diameter; - 1.2%); R 305/25R19 (25.00 diameter;+ 0.16%). Good luck.
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Old 10-09-2011, 10:35 PM
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i run 225 35 19 8.5 wide front and 315 25 19 12 wide rear. Front and rear tires are 25.2 diameter
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Last edited by trisgale; 10-09-2011 at 10:40 PM.
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Old 10-09-2011, 10:41 PM
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Quote:
Originally Posted by trisgale View Post
i run 225 35 19 8.5 wide front and 315 25 19 12 wide rear. Front and rear tires are 25.2 diameter

you run this on your C4S??
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Old 10-09-2011, 10:42 PM
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yes, as long as the front and rear tire diameters are the same or very close you shouldn't have a problem.
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Old 10-09-2011, 10:47 PM
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Quote:
Originally Posted by trisgale View Post
yes, as long as the front and rear tire diameters are the same or very close you shouldn't have a problem.
awesome! thanks a lot for the help, what tires if i may ask
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Old 10-09-2011, 10:50 PM
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Quote:
Originally Posted by Dennis C View Post
19" wheels/tires aren't recommended by Porsche for the C4S, so it's hard to say what might happen to your differentials.
wtf? thats the stupidest thing i have ever heard...

OP 19's you need to Run Front 225/35/19 and Rear 315/25/19... You can also use 235/35/19 in the Front

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Originally Posted by jawls911 View Post
you run this on your C4S??
yes and have been for 5 years... 100,000km plus
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Old 10-09-2011, 10:51 PM
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Siam, you can run 235-35-19/315-25-19, but the tire choice are narrow and don't think you can get any aggressive tires with that. Another choice is 295-30-19 rear. I have them on my TT for some times now and they actually feels better than my last 315 setup due to more side wall. Both are within Porsche recommend 4% front and rear diameter ratio. Sent me some high-res. pics once they're on!
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Old 10-09-2011, 10:56 PM
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awesome! thanks a lot for the help, what tires if i may ask
I'm running Toyo T1R
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Old 10-09-2011, 11:39 PM
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Quote:
Originally Posted by Ray View Post
Siam, you can run 235-35-19/315-25-19, but the tire choice are narrow and don't think you can get any aggressive tires with that. Another choice is 295-30-19 rear. I have them on my TT for some times now and they actually feels better than my last 315 setup due to more side wall. Both are within Porsche recommend 4% front and rear diameter ratio. Sent me some high-res. pics once they're on!

I'm running the 235-35-19/315-25-19 set up lowered on PPS10, dog bones, adj toe r toe steer and drop links. No issues. Just be careful with the offset. R compounds are limited in these sizes.
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Old 10-10-2011, 12:06 AM
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Quote:
Originally Posted by Ray View Post
Siam, you can run 235-35-19/315-25-19, but the tire choice are narrow and don't think you can get any aggressive tires with that. Another choice is 295-30-19 rear. I have them on my TT for some times now and they actually feels better than my last 315 setup due to more side wall. Both are within Porsche recommend 4% front and rear diameter ratio. Sent me some high-res. pics once they're on!


thanks ray!!

yea i just ordered my JRZ coils today so i am just waiting on some tires now but i know for sure i would like to get some R-comps. ill look into what companies make the sizes you guys have all suggested and see what i can do with my budget haha.

thanks again guys!
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Old 10-10-2011, 07:38 AM
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Quote:
Originally Posted by Zookie View Post
wtf? thats the stupidest thing i have ever heard...

OP 19's you need to Run Front 225/35/19 and Rear 315/25/19... You can also use 235/35/19 in the Front



yes and have been for 5 years... 100,000km plus
What's stupid about making a decision based on test data?

Many people who I consider to be quite knowledgable about Porsches and 996s in particular recommend staying at 18-inch wheel sizes for this vehicle, just like Porsche recommends. I don't think they are stupid.

That being said, you can put whatever you want on your own car. I've seen 996s with 20-inch wheels before. There's probably someone who has put 21s on or is considering it.

My point is that asking for a recommendation on a tire size when you're using a wheel size that's not recommended by the manufacturer will give you answers that are not based on any pertinent data. You'll get answers from people who say things like: "use this size, it doesn't rub at all" or "I'm using this and it doesn't cause any problems". If that's how you'd like to make a decision on tire size, then go for it. If you'd like to make a decision based on legitimate testing by the manufacturer, then stick with the Porsche recommended sizes.
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Last edited by Dennis C; 10-10-2011 at 07:41 AM.
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Old 10-10-2011, 10:26 AM
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Quote:
Originally Posted by trisgale View Post
i run 225 35 19 8.5 wide front and 315 25 19 12 wide rear. Front and rear tires are 25.2 diameter
I could not agree with you more with both being of equal diameter. Though aesthetically speaking, I feel a 225 35 19 will not fill the width of an 8.5 rim. It may leave a 1/2" gap between the bead of the tire and the bead of the rim.
Thus, a 245 30 19 would address this issue with a slight difference in diameter. Personal choice, I presume.
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Old 10-10-2011, 08:20 PM
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"wtf? thats the stupidest thing i have ever heard..."

Zookie!! LOL you beat me to that comment! I was going to say the EXACT same thing.
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Old 10-10-2011, 08:20 PM
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