OZ Alleggerita

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06-02-2011 | 02:00 AM

#16

echere88

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Joined: Nov 2004

Posts: 83

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From: SoCal

Quote:

Originally Posted by mdrums

hummm....I would not want 8.5 front and 11 rear for track wheels. You are limited to tire sizes and it is much much better to stretch the side wall than to undersize the sidewall. I can't preach this enough for high performance driving!

Is there any way to explain this in other way to make it easier to understand? Thanks

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06-02-2011 | 02:17 AM

#17

Dr.Bill

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Joined: Jan 2008

Posts: 4,690

Likes: 726

From: Scottsdale, AZ

Quote:

Originally Posted by mdrums

Also I take it you car is a 997? If so make sure you get 9x18 and 12x18...11.5x18 will work ok too. I see so many that mess this up and get wheels that are too narrow.
Tires sizes that fit and work great are:
245/40/18 and 305/35/18

or

255/35/18 and 315/35/18

What would be the correct offsets for a 2009 C2S?
9x18 and 12x18 wheels.
Thanks!

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06-02-2011 | 11:02 AM

#18

997_rich

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Joined: Apr 2010

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Graphite. share pics when you pull the trigger.

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06-02-2011 | 11:11 AM

#19

mdrums

Race Director

Joined: Mar 2006

Posts: 15,358

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From: Tampa

Quote:

Originally Posted by echere88

I've been reading lots of threads about track wheels and tires size. Many of the experts here preferred running 245/40/18 and 305/35/18. Based on the tire size, most of the manufactures recommend or approve 8.5 and 11.

So can experts here share more insight with using 9 and 12 rim? Thanks

For optimul tire performance you want the widest wheel possible. You want to control the side wall flex and slightly stretching the sidewall is the way to go. This allows the side wall to flex a little in a turn and roll over just slightly keeping the most tread possible on the ground. Alignment also helps this a lot. Having a wheel on the narrow side of spec will allow the sidewall to move around more and roll over more. This is effect that crips turn is that you want and make things feel a little slower in the steering and mushy. On the other hand you do not want a tire profile that is so low that it is like riding on rocks. The tire flex is part of the suspension and it all works together.

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