im the firt to admit when im wrong... and i very well might be on this issue... again i stress.. bring me the facts... anyone can state the obviouse... but can it be proven?
prove me wrong with fact and i will back down. period.

 

The fact that Porsche's racing arm uses 18 inchers doesn't prove it too you? If that doesn't prove it then I don't think anything will?

 

i think thwey use 18s because of the ride height... they need to be low for improved aero dinamics, plus if im not mistaken i think theirs a tire size limit on the rule book.... so no that wouldnt prove anything.

 

18"s are the optimal size for a 996 as far as performance is concerned. The 19&20 combo is actually worse than 19"s all around and 20"s is just bad all together. I have been tracking Porsches for about 13 years and have tried many different tire/wheel size combo's. What brand of wheels are you running on your car, fast0c996t?

 

they're hre's

 

I am working on some more facts for you but this comes from the Porsche brochure:

"And then there's the Turbo wheel, whose profiled spokes help reduce lift and improve braking by drawing warm air from the brake discs out around the sides of the car instead of beneath the chassis. Lightweight aluminum alloys and a patented hollow-spoke design also manage to shed 24 lbs of unsprung weight into thin air, resulting in more precise cornering and quicker stops.

Now tell me that your 19 and 20 inch wheels weigh less than the stock 18 inch hollow spokes? Unsprung weight will definately effect handling!

 

which model?

 

Can you post a pic of the car with the 19&20's on it?

 

thank you sir. you got me... i am wrong!

 

read this:

An important concept is "unsprung weight." This is weight that is not supported by the suspension of the car. This usually includes the the weight of the wheels and tires as well as a percentage of the weight of the suspension itself, including control arms, anti-roll bars, shocks, and struts. Reducing unsprung weight is the key to improving handling. The lower the unsprung weight, the less work the shocks and springs have to do to keep the tires in contact with the road over bumpy surfaces. An easy way to reduce unsprung weight and improve traction is to replace stock wheels and tires with special lightweight wheels. Note that as the wheel diameter or width increases, the weight of the overall wheel and tire package increases, thereby increasing unsprung weight

 

Buddy:
Unsprung weight is only one of the issues with running larger wheels.
The profile of the tire on 20"s for a 996 is like a rubber band, thus not allowing any/little flex on the tire around corners. There is a reason Porsche ran 18"s in their 996 Cup Cars. The staggered 19's and 20's are not a very popular fitment for Porsches, but you see 360's, 430's, Gallardos etc running similar sizes. While they might look better to some, there is absolutely no positive performance advantage on a 911.

 

yellow 20's...i still have 18's for track and inclimate weather

 

Thanks Luis!

Now fastoc996twint I am not saying that 19's don't look good on the car because they do! Just for handling purposes I prefer the 18's. Show us some pics of your car.

 

ill post asap...