7/15m is definitely fine with the c2s. I'm not sure how it will look if you switch to the 305's though.

 

[QUOTE=GrayBlack;4007734]7/15m is definitely fine with the c2s. I'm not sure how it will look if you switch to the 305's

It would seem adding 10 mm with change in tire(295to 305) and a 7 mm spacer yields 17 mm more than I currently have. If I added a 15 mm spacer with 305's that's 25 mm addition. That may be excessive. I'm confident someone has changed rear tire width to 305's on c2s and added spacers. Bueller.., Bueller

 

I have recently installed 7/15 on my C2S and it is perfect. I really cant believe why Porsche did not ship the cars with this setup. Here is a pic after the mod. The pic does not do justice, it looks so much better in person.

 

I posted this on Rennlist too, but I had really lousy luck with 7mm spacers, until I got the Brey Krause with a centering lip. 7mm spacers do not let the hub engage the stock wheels, due to the camfer on the inner lip of the wheels. I had intermittent vibrations until I went with the BK 7mm with the centering lip and now all is good. 7mm front and 15mm rear look great on my C4S.

See here for pics:
https://www.6speedonline.com/forums/...ml#post4008408

 

Ive read some people has had problems with vibrations, that depends on the brand, I was thinking on getting RSS or some other brand I saw on eBay.
What are the recommendations for this?

 

I do, too. Go big or go home.

 

are u running oem 295 rear pirelli's. if so, what would u think about your same setup with mich pilot ss 305's in rear. too excessive?

 

thanks for the input. i saw your post on rennlist- if i recall you noted the 15mm were rss,and the 7mm were BK - is that correct?

 

Yup! the 15mm spacers are easy, pretty much any with a centering lip will work fine, the 7mm were the ones I had trouble with.

 

I got the following email from a rss dealer when I asked about vibration with their 7mm spacers::

Hi Hector, not sure about any reported issues except with certain incorrectly designed aftermarket wheels, incorrect installations, and incorrect or out of specification alignments which may have resulted in reported vibrations.

 

Also got this answer from another dealer who carries Rss and brey Krause:



Hello Hector

I spoke with Brey Krause, and they have not confirmed fitment of their
spacers on the 991 chassis as of yet. We do not keep their spacers in stock,
although they do have all of the sizes available. Brey Krause will let us
drop ship to you and if for some reason they do not fit, they said it would
be ok to return them.

The Brey Krause wheel spacers are $250/pair and are available in 2.5, 5,
7.5, 11, 16, and 20mm.

We do stock the wheel spacers from RSS, and they have been confirmed to fit
the 991. I have the 7mm and the 15mm spacers in stock in silver. 7mm kit is
$130.00 and the 15mm kit is $170.00. The RSS spacers include longer wheel
bolts.

If you are interested in the RSS spacers you can order them from our site
here:

http://www.stableenergies.com/RSS-Wh.../productinfo/R
SS-WSK/

If you would like to order the Brey Krause spacers, please give us a call as
they are not on our website just yet.

Let me know if you have any other questions.

Best Regards,

Joe G

 

I have had BK 7mm spacers on both my 2013 C2S and it's replacement, a 2013 C4S cabriolet. They fit great and took care of the vibrations I've been having with two other brands of 7mm spacers.

 

Thinking of getting BK 7mm for the front and RSS 15mm in the rear, this way I could save some money since BK are much more expensive, but I'm not sure if the anodize finish will be exactly the same or they might look odd.

 

You can't see them from outside the car unless you are standing within 6" of the wheel.