1of250

I'm contemplating upgrading the stock wheels on my America Roadster from the stock 17's to 18" 3 piece turbo rims. My mechanic has warned me that it may be like running around the block in Nikes then switching to wing tips and running around the block again. Have you done this and what were the results on the handling? I don't want to do it simply for esthetics.

Jack667

Yes - I have done this.

I used to run with wingtips when I got my first job out of college - selling insurance!

I was amazed at how comfortable a good pair of wingtips can be!

Not only did I have great stability, even around corners, but I looked great, too! (IMHO)

Jack667

ps - They were Bostonians! Highly recommended!

Jack667

OK - sorry - Check this out:

<img src="http://www.ranrace.com/jack/done2.jpg" alt=" - " />

I recently upgraded to 18" 3-piece rims and they are not too bad, in terms of harsh ride. I also have a "sport suspension"

Jim Michaels

Good one, Jack.

1 of 250: Porsche never approved the use of 18" wheels for 964s. They sent several such notices to dealers in the '90s. There may have been some special exceptions, but I don't know if your car was one of them. Nonetheless, quite a few 964 owners have gone to 18" rims and I have read only a few complaints.

AK

I have read in many places the reasons for Porsche not authorizing a plus 2 wheel sizing but it does not seem to be anything that is specific to the 964. It seems that all cars would share these issues. I have run a plus 2 on every car that I have owned and have had no problems and not heard of anyone having problems till I got to here. So is it that Porsche owners are just that more parnoid than say BMW owners? They tend to take their cars to the track more? What gives?

Mr. C4

Hey,

Im fitting a set of brand new 18" 3.6 Turbo splits next week with Dunlop Formula D101J tires and the supplier (very well know Porsche wheel supplier) has not had any issues with the hundreds of set he has sold over the years. The tires will be in the size of 235/40/18 front on 8x18" and 265/35/18 at the rear on 9.5x18".

The 90s Carrerar Cup in Europe was run on 18" wheels so why not! And what the h... it looks absolutely stunning.

Ciao,

Johannes E.

dbelleperc

Here is a link to a discussion I had on 18" rims on a 964 <a href="http://forums.pelicanparts.com/showthread.php?s=&threadid=90300" target="_blank">18" Rims</a> and also click the other thred in the post to read on some more info. I email wheel enhancements and this is what they said "You can use the 8x18" and 10x18" Factory 2002 996 Carrera 5-spoke wheels on a 1992 964 C2" Plus look at this awsome picture! P.S. I like to see the big reds between those rims. <img src="http://www.pelicanparts.com/MotorCity/dbelleperc/964_996wheels2.jpg" alt=" - " />

1of250

Thanks all for the input. I'll post before and after shots later.

adsc4s

David, your car looks great. Here is a pic of mine with the Speedline 3.6 Turbo wheels.

<a href="http://boards.rennlist.com/upload/Car8.jpg" target="_blank">http://boards.rennlist.com/upload/Car8.jpg</a>

Christer

David

I would like to join the ranks of admirers of those wheels. Do you know how much they weigh?

1of250

Christer brings up a good point. I heard that it is the weight of aftermarket + 1 or 2 applications that cause the bad feel and handling. The goal I'm told is to ensure that the new wheels, regardless of their diameter are roughly the same weight as the wheels that came stock on the car. Anyone else hear this explanation?

Jim Michaels

Extra ugly unsprung rotating mass certainly hinders acceleration and braking, but it's probably having less sidewall that contributes to the rougher feel across uneven surfaces. I'd prefer to have wheels lighter than OE, which is easier to do now than when standard OE wheels were forged Fuch.

1of250

Anyone know what the 17" stock cup's weigh?

RSAErick

Check <a href="http://www.wheelweights.net/" target="_blank">http://www.wheelweights.net/</a> for various wheel weights. I suspect that there are some errors and inaccuracies there, but it might be useful still.

I just weighed my front Cup 1's (17" x 7") with Kuhmo Ecsta 712's... 43 pounds!!! More than I thought, but I've heard that the Kuhmo's are one of the heaviest tires on the market.

Erick