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YOUR RESEARCHThinking about 285's or 295's on rear?
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Install 265's
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My guess is you have the 7.5" based on the fact that you have the factory installed 265's on the rear.
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Suggestion
If you don't want to change wheels, stay with the 225 and 265 sizes.
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Suggestion · Original poster
I only use the car for street use so would it compromise handling alot by putting on wider rear tires?
Use so would it compromise handling alot by putting
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Suggestion · Original poster
I only use the car for street use so would it compromise handling alot by putting on wider rear tires?
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I have the stock 18" rims on my C4 and the stock tires do not fill out the rims. I only use the car for street use so would it compromise handling alot by putting on wider rear tires? Any alignment changes that need to be made?
Thanks
I think 295's are overkill personally. I have 285's on mine and I am already thinking about going to a 235 or 245 up front to help dial out some understeer.
On the positive side though... I had ZERO tire spin unless I simply dumped the clutch with my 285's. Right now I have the stock 17" wheels on and I can break the rears loose in first gear by simply taking off in a semi quick manner.
Viken - If I have the stock 18" Sport Designs, then can I safely go upto 245 in the front? Or would 235 alone cure some of the initial turn-in understeer? If I do goto either 235 or 245, what else would you recommend that I get done (offsets, different alignment specs, etc..)?
Thanks amigo!
If you have the 7.5" front wheel, I wouldn't even think about going bigger than 225. But, if you have the 8" version of the Sport Design, I'd go with a 235. The 245 tire is really much happier on an 8.5" or 9" wheel.
As to your question regarding understeer reduction, I would say you are better off playing with alignment settings rather than increasing tire width up front. There has been much discussion on this
here
. What suspension do you have, if you have something other than stock US, you may be able to dial-in some more negative camber in front. Consider about -1� 20' in front and -1� 40' at rear. Stock US specs are 0� front and -1� 10' rear.
I apologize for the late reply due to work demands.
Nick - Currently, I have the original Conti's 265/35-18. I will be replacing them with the same size S-02-A, per the consensus here.
Viken - Currently, I have 225/40-18 on the front. How do I ascertain whether I have the 7.5" or 8" front wheel? I have the stock US suspension for now.
Look straight at the valve. To one side, you will see the offset of the wheel (either 50 or 52 mm), to the other, you will find the size (either 7.5" or 8"). My guess is you have the 7.5" based on the fact that you have the factory installed 265's on the rear. When Porsche upgraded the front wheels to 8", they also went to 285's on the rear. But, that was done from 2002-on.
Thanks Viken. Will do when I get out of here today. But let's say that I do have 7.5", then is my best (only?) option is to goto ROW 030 to reduce that annoying turn-in characteristic?
If you don't want to change wheels, stay with the 225 and 265 sizes. Then, you can either get the ROW M030 and dial-in the most negative camber you can, or get a coilover setup which will allow you to lower the car even more with further negative camber. How aggressively do you drive? And, how often, if at all, do you drive at the track? If you drive mostly on the streets, you should be happy with the ROW M030.
Viken - I think you just answered my question. Coilovers would be overkill for me and stock suspension is a bit 'lethargic'. Thus, ROW M030 it will have to be. It is something that I have been interested in doing all along and this just confirms it.
Thanks!
245/35 - 18s in front
285/30 - 18s in Rear
After much experimentation with various sizes throughout the 17" and 18" wheels, this is definitely the best setup, both on the track and on the autocross course for a 996.
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