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Why the 991 has larger wheels...

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Old Sep 3, 2011 | 12:27 PM
  #11  
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F1 cars weigh 1,411lbs and its brakes are replaced after a 200mi race. A 997 weighs ~ 3,200lbs and (thankfully) has a much longer maintenance interval.
Apples and oranges.
 
Old Sep 3, 2011 | 03:35 PM
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well that make sense but I never heard anyone complaining about the lack of braking in a 997 though...
 
Old Sep 3, 2011 | 05:21 PM
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i'm sure its both function and aesthetic. on their web special it states not only do the larger wheels help dynamic performance but look imposing as well.

lets not forget 20's are the new direction for high performance vehicles, as seen on the Ferrari 458, 599, optional on the California as well as the Aventador.
 
Old Sep 3, 2011 | 05:27 PM
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Originally Posted by ECB
well...on the Porsche website they say that the bigger diameter was chosen for improved performance and comfort...
Originally Posted by dallascajun
I think the 'improved performance' comment can be tied to improved braking performance also.
it "could"...yes..

but what always is in my mind when it comes to 20s is the highe unsprung weight and the greater roll diameter which actually makes the car accelerate slower...
what´s the trick here then?

lighter wheels,shorter gearing?
 
Old Sep 3, 2011 | 06:07 PM
  #15  
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Originally Posted by ECB
it "could"...yes..

but what always is in my mind when it comes to 20s is the highe unsprung weight and the greater roll diameter which actually makes the car accelerate slower...
what´s the trick here then?

lighter wheels,shorter gearing?
From what I've gathered, the PDK gearing is the same, the manual gearing is now has the same ratios as PDK, and all 20 inch options are lighter than the 19 inch options of the 997.
 
Old Sep 8, 2011 | 07:56 PM
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Because of the brakes? Was braking really a problem?

I believe it's either aesthetics or they wanted more rubber on the road.

A larger outside diameter tire has a longer tire contact patch, and therefore more potential grip.
 
Old Sep 8, 2011 | 07:58 PM
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Originally Posted by Shinkaze
Because of the brakes? Was braking really a problem?

I believe it's either aesthetics or they wanted more rubber on the road.

A larger outside diameter tire has a longer tire contact patch, and therefore more potential grip.
Why not make better... What you can make better?
 
Old Sep 9, 2011 | 08:50 AM
  #18  
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RSR runs 18s and brake clearance is not an issue... Same with all cup cars

Straight fashion move

20s on a 911 are ridiculous
 
Old Sep 9, 2011 | 04:18 PM
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Originally Posted by PJS
RSR runs 18s and brake clearance is not an issue... Same with all cup cars

Straight fashion move

20s on a 911 are ridiculous
but aren't those on 997 & 997.2 model.

20s look great BTW.
 
Old Sep 9, 2011 | 04:21 PM
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Yes they are 997s but I would be surprised if the 991 cup runs anything larger than 18 inch rim
 



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