[MCL968]

I am looking at a set of four 993 Cup (Cup 2) wheels. Sizes , offsets, and part numbers are:



7" 55 offset, Part # 993.362.124.00

9" 55 offset, Part # 993.362.128.00



Will these 993 Cups (Cup 2s) bolt on my 92, or will I need spacers? These seem to be a popular wheel for 968's.

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[MCL968]

I have edited the above post 10 times and I still can't make the copy read right. I think something's up with the editor.

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[PorscheG96]

[quote name='Tahoe968' timestamp='1394307286' post='155800']



<img src="/forum/images/smilies/968/rock.gif" class="smilie" alt="" /> Jump on these.....



http://sfbay.craigslist.org/sby/pts/4357888830.html[/quote]

Those are heavy aftermarket Mille miglia wheels not Porsche wheels. I'd pass on those although the offsets are better.



You can run 225/45 on 7" front wheels just fine. Porsche used 255/40 tires on 17x8 rear 964 wheels! Actually, these days I like the 7 better than 7.5 because it sticks out farther...et65 is too far inboard of the fenders.

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[Cloud9...68]

Grassroots Motorsports recently ran an extensive tire test in which they compared not only several different brands, but they compared the performance of one of the tires (the new BFG G-Force Rival) on different width rims. The difference was huge - when mounted on rims about the same width as the tires (in their case, 225/45-15's on a 9" vs. an 8" wide rim), their lap times were about half a second quicker with the same tire on the 9" rim, and subjectively, they said the steering response was much better on the 9" rim. I bet tire life would be better, too, as there would be less roll of the sidewall during cornering. And I wouldn't have thought a 225 tire would be too wide on an 8" rim. So, based on this, I wouldn't put a 225 tire on a 7" rim - more like 205.

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[flash]

the post has now been correctly edited. the problem was you kept entering the wrong name for the wheels. they are 993 Cup, modeled after the wheel that came on the 993 Cup car. a number of people mistakenly try to refer to the rim as a 93 something. the editor tries to correct it to the proper term. sometimes it doesn't quite get it.



as for tire size on a 7, for track performance a 205 will likely be better. for normal street use, a 225 might give a better ride, and a bit more initial grip. depending on the sidewall construction, it may get a bit "wallowy" though.

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[nibn968]

Well I found the following on ebay and got them.



7x17 and 9x17



They also came with nice Continentals with about 80% tread left.



Tires are 205s front and 245s rear.



All for $960 including shipping.



What you all think of this setup?

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[flash]

re: MCL's post - not sure what happened, but i fixed it again.



i hate continental sort contacts (touring, 2, and 3). slipperiest tires i've ever had.



but, for the price, that seems like a good deal.

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[Cloud9...68]

Flash,



Good point about tire sizing - I guess it comes down to how the car is going to be driven.



Now for a quick (or maybe not so quick) vent - there isn't a lot I don't like about the 968, but the wheel situation Porsche put this car in is just ridiculous. First of all, why in Ferdinand's name does a car with 50/50 weight distribution and modest power output need a staggered set-up? The optional 9"/7.5" set-up is bad enough, but the poor availability of 7.5" wheels pushes people into an even more ludicrous 9"/7" arrangement. I know, it's all for looks, but as a committed form-follows-function kind of guy, I find Porsche's bowing to fashion downright cringe-worthy. And it's not just Porsche - our 2007 BMW 328i has exactly the same set-up, so tires can't be rotated front-to-back. This is just dumb.



And then there's the only-for-Porsche 5 x 130 mm bolt pattern. Aaaarrggghhh!!!! This leaves the 968 out of the large selection of quality lightweight wheels available to other cars through the aftermarket. Very frustrating. End of rant.

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[94SilverCab]

I purchased wheels only with painted center caps...near mint condition...$600. I feel I got a great deal.



YMMV,



Jay

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[PorscheG96]

[quote name='Cloud9...68' timestamp='1394376218' post='155813']

Grassroots Motorsports recently ran an extensive tire test in which they compared not only several different brands, but they compared the performance of one of the tires (the new BFG G-Force Rival) on different width rims. The difference was huge - when mounted on rims about the same width as the tires (in their case, 225/45-15's on a 9" vs. an 8" wide rim), their lap times were about half a second quicker with the same tire on the 9" rim, and subjectively, they said the steering response was much better on the 9" rim. I bet tire life would be better, too, as there would be less roll of the sidewall during cornering. And I wouldn't have thought a 225 tire would be too wide on an 8" rim. So, based on this, I wouldn't put a 225 tire on a 7" rim - more like 205.

[/quote]

But that doesn't mean that a 205 tire on a 7" rim is better than a 225 tire on a 7" rim. It also doesn't mean anything for a street car where the 7" rim is more widely available and 225 fits just fine - plus it could be argued that ET55 offers wider track and better performance than ET65. Of course a 225 tire is better on an 8" rim than a 7" rim, but I've even run 245 tires on 7" rims which increased front grip and my lap times. Of course the steering response wasn't as crisp but I adapted very quickly.

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[flash]

at low speeds, like an autocross, this is correct. in fact, in autocross, the extra roll from the tire can really help (that's why the really fast guys disconnect the front swaybar) when it comes to tire width and the extra sidewall, it's the same for a street car. for a track car, where you are going much faster, and the moment of transfer is much more significant, the extra sidewall can be treacherous.



again though, this goes as much to the particular tire design as it does to the width. you can go wider with a stiff sidewall tire than you can with a soft one.



no one right answer

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[MCL968]

If I may call for the question, will these fit my 968 without any undue or unnecessary hassles?



To reiterate:



Front: 7" 55 offset, Part # 993.362.124.00

Rear: 9" 55 offset, Part # 993.362.128.00



I believe from what I have read that these should fit without any problems, but I don't want to plunk down the cash until I hear from those experienced in such matters.



Thanks,



M-

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[94SilverCab]

MCL - Direct answer - YES.



The wheels will fit and there is no requirement for spacers.



Jay

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[nibn968]

I am also going to change the shocks on my 968. I would be using Bilstein HD shocks for the back. I am having some trouble locating front Bilsteins. Are HDs available for the front? If not what Bilsteins should I use for the front?

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[flash]

based on what i have felt so far, i wouldn't put bilsteins on any 968. worst ride i've ever felt. much better stuff out there.



but this is a thread about wheels, not shocks. let's keep it that way. there are great places for discussions about shocks.

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