996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Wheel width question. Wheel Manufacturer has two different sizes for F and R wheels ?

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Old Mar 29, 2004 | 09:31 AM
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Wheel width question. Wheel Manufacturer has two different sizes for F and R wheels ?

The wheels I am getting are offered in two different sizes for front and rears. The front available sizes are 8.5 or 9. The 9 has a larger lip by 1/2 inch. The rears are offered in 11 or 11.5" The lip is 3.5" and 4" respectively. I am going with 235/30/19 fronts and 315/25/19 rears either way, so, which is the optimal set-up? Thanks for your assistance.

Lou
 
Old Mar 29, 2004 | 09:36 AM
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8,5 front and 11,5 rear.
 
Old Mar 29, 2004 | 11:13 AM
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Originally posted by Crash
8,5 front and 11,5 rear.
The set-up will not cause any bad handling or extra over or under steer compared to the normal 8 and 11 set-up? The way the manufacturer has the setup is either 9x19 with 11.5 x19 or 8.5x19 with 11x19. You can buy the 8.5 front and 11.5 rear, which is actually what I prefer, but, this is an AWD car unlike the GT2 which uses 8x19 and 12x19. Anyway, my head is spinning, any additional advise is very very helpful.

Lou
 
Old Mar 29, 2004 | 12:19 PM
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The GT2 has 8,5" fronts and 12" rears. Of course there are also guys using 8" front and 11" rears with the tire dimensions you mentioned, but I seriously think you can´t go wrong with the 8,5/11,5 combo. I think KPV uses the same sizes.
 
Old Mar 29, 2004 | 12:28 PM
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Originally posted by Crash
The GT2 has 8,5" fronts and 12" rears. Of course there are also guys using 8" front and 11" rears with the tire dimensions you mentioned, but I seriously think you can´t go wrong with the 8,5/11,5 combo. I think KPV uses the same sizes.
I know the GT2 has the 8.5 front and 12 rears, however, it is a rear drive car and I have an awd. Does that make a difference?

Lou
 
Old Mar 29, 2004 | 01:00 PM
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Lou,
There are many people using the 8.5 and 11 setups without any adverse effects. I am running 8.5 and 11.5. I cannot comment on using 9's in the front since I do not know anyone using them.
If I were you, considering the way the tires fit the rims, I would stick with 8.5 and 11. The 11.5 seems a little too wide for the Yokohamas that I am using. I am splitting hairs here but since we do not have many 19 inch tire choices, you may as well get rims that work perfectly with what is offered. The tire sizes of 235/35 (NOTE THEY SHOULD BE 35 AND NOT 30) and 315/25 keep the overall diameter between front and rear within reason and that is one of the most important considerations. You do not need 9 inch wide front rims to accommodate the 235's.
 
Old Mar 29, 2004 | 01:28 PM
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I agree with Ken 100%. Cargraphic's 19x9 and 11.5 setup uses Dunlop 245/30 front (that is not a typo) and 305/25 rear which is actually wider than the AVS 315 at the tread block.
 

Last edited by Wheel Experts; Mar 29, 2004 at 02:29 PM.
Old Mar 29, 2004 | 02:17 PM
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The only reason for the extra 1/2 inch in either case is for a bigger 'lip.' This is purely for looks.

What you will sacrifice is strength of the lip. Trust me on that one.

There is a price to pay for bling bling.
 
Old Mar 29, 2004 | 03:17 PM
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as i told u Lou
 
Old Mar 29, 2004 | 03:55 PM
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Originally posted by KPV
Lou,
There are many people using the 8.5 and 11 setups without any adverse effects. I am running 8.5 and 11.5. I cannot comment on using 9's in the front since I do not know anyone using them.
If I were you, considering the way the tires fit the rims, I would stick with 8.5 and 11. The 11.5 seems a little too wide for the Yokohamas that I am using. I am splitting hairs here but since we do not have many 19 inch tire choices, you may as well get rims that work perfectly with what is offered. The tire sizes of 235/35 (NOTE THEY SHOULD BE 35 AND NOT 30) and 315/25 keep the overall diameter between front and rear within reason and that is one of the most important considerations. You do not need 9 inch wide front rims to accommodate the 235's.
The yokos are far more narrow in 315 size than the Contis or PS2's. I am not so much worried about them being too wide for the tires as ShankGT2 runs 12" wide wheels on his GT2 and the Contis fit perfectly. I am more worried about rubbing issues and decreased handling capabilities. I definately like the 11.5 rear and large lip, but, as many have pointed out, will it rub? Handle worse than with the 11" rear?

So, when I get tires they should be 235/35, not 235/30?

Lou
 
Old Mar 29, 2004 | 03:56 PM
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Originally posted by Hamann7
The only reason for the extra 1/2 inch in either case is for a bigger 'lip.' This is purely for looks.

What you will sacrifice is strength of the lip. Trust me on that one.

There is a price to pay for bling bling.
Are they that much weaker in 11.5 versus 11? If you go with the Carg, you would be using 12" rears in 18" correct? Would that then be even weaker and bigger lipped?
 
Old Mar 29, 2004 | 03:57 PM
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Originally posted by 20C4S
as i told u Lou
Arling, what size are the fronts you sent?
 
Old Mar 29, 2004 | 07:02 PM
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LSM,

To answer your question I need to know what manufacturer you are using for tires. The width of your wheel will affect how the particular tire is spread on the road. This in turn has some affect in the oversteer/understeer department.

I can give you my opinion then.
 
Old Mar 29, 2004 | 10:27 PM
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Originally posted by cjv
LSM,

To answer your question I need to know what manufacturer you are using for tires. The width of your wheel will affect how the particular tire is spread on the road. This in turn has some affect in the oversteer/understeer department.

I can give you my opinion then.
To be honest, I would love to use the PS2's, but, mqy be forced to use the contis. Sizes are 235/35/19 fronts and 315/25 rears regardless of the rear tire width.

Lou
 
Old Mar 30, 2004 | 05:22 AM
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LSM,

The thread width on the 235's is 8.5" so go with 8.5 inch wide wheel up front. I couldn't find the thread width on the 315 but the 305 is 10.9 inches. I would go with 11.5-12.0 inch wide wheel for the 315's.
 


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