Porsche Factory Carrera S – 100 lbs, 0 oz.
8.0 x 19 22 lbs. 4 oz.
11.0 x 19 27 lbs. 12 oz.

Porsche GT3 – 110 lbs, 4 oz.
8.5 x 19 24 lbs 5 oz
12.0 x 19 30 lbs 13 oz

 

Thanks...well its obvious the GT3 wheel is heavier for a few reason but mainly it is a larger wheel in width both front and rear as well it wears a much lower profile tire so some additional strengthening is probably another culprit

 

Larger wheel yes but profile of tires are the same -

235/35-19 front
295/30-19 or 305/30-19 rear

 

You left a lot of wiggle room by stating “best I can tell�, “almost conclusively� and “just isn’t much different� but I would still be interested in seeing the data that is proving that reducing unsprung (and rotating) weight is comparable to reducing an equal amount of sprung weight.

 

GT3 wheels on a 997 are hot. I have been looking for a black set. Good luck.

Aloha

Byron

 

There is far from any confilct about reduction of unsprung weight study some physics and get back to me..no worse enemy to the car then unsprung weight...unsprung weight reduction 4x sprung...it is very hard to reduce unsprung weight PCCB helps alot and using lighter weight wheels as well...
I agree for street use and the way most of us use the car do we actually notice? who knows?

 

I understand and can appreciate reductions in unsprung (and rotating) weight but wanted elh0102 to defend this statement.
I wasn’t aware that they had receded some of the laws of physics.

 

Fellows, I'm not interested in an argument; didn't mean to start one. Obviously, math doesn't lie. The problem is, it often doesn't say much of practical application either. I went through several sets of lighter wheels/tires on two different cars. The influence on the feel of the car in handling was noticeable (better transmission). But, the impact on either speed or acceleration was negligible, if any. My only point, and it was probably poorly offered, is that unless you are in this track stuff at a very advanced and competitive level, weight need not be your primary criteria for wheel selection. I found four or five articles through internet searches that offered some quantitative data supporting this position.

 

I had 19'' techarts on my car and I switched back to the lobsters. I can not stress how different the car feels. It is literally night and day for me. It was a completely different car and extremely noticeable for daily driving. Its not a matter of negligable speed. It's a matter of driving enjoyment. Thats the reason most people buy high end autos. For the enjoyment. For me, heavier wheel, less enjoyment. GO LAKERS!!!!!!!!!

 

some old pics of my car...but you can take a idea

 

I think that's becuase Michelin Sport Cups only comes in 305/30/19. I have them mounted on my 2nd set of lobsters.

 

I personally don't understand the logic behind buying a new set of wheels that are heavy cast units that come on a different Porsche. I could see the logic if they were the best wheels available for our cars - but they aren't, not by a long stretch. For about the same money, you can get an aftermarket set of forged wheels, which will be lighter (better performing), stronger, and a better fit (12" is just too wide even for 305s - 11" is the right size). Whatever one likes one should get - but don't be fooled that because the wheel comes on a GT3 that it's a great wheel...

 

I am not disagreeing that the GT3 wheels might not be the best wheel, but some might just want a different look than what came on their car, keeping it stock looking and not necessarily worried about weight. I have really only seen few cars that I like with after market forged wheels. Again this is just an opinion. And how are 305's too small for 12" rears. They don't appear to be stretched nor does anything rub.