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Unread 01-31-2009, 02:04 PM   #1
warmfuzzies
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Default 18" wheels

Should I?

Well I have but like Marc, I wanted to have my first thread here.......roll on
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Unread 01-31-2009, 03:51 PM   #2
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we need to get some more people to come on over!
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Unread 01-31-2009, 11:01 PM   #3
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Spread the word gently, and I guess if IB forums annoy us all too much, we'll just migrate over.

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Unread 02-12-2009, 11:28 AM   #4
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Quote:
Originally Posted by warmfuzzies View Post
Should I?

Well I have but like Marc, I wanted to have my first thread here.......roll on
Why not? The factory did caution against their use but there are many 964s that are so equipped.

Tire clearance can be an issue but as long as reasonable tire choices are made it can work.

I do have to say that to my eye, 8 & 9 x17 Cup1s look perfect on 964s
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Unread 03-06-2009, 12:13 AM   #5
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Quote:
Originally Posted by Bill Verburg View Post
Why not? The factory did caution against their use but there are many 964s that are so equipped.

Tire clearance can be an issue but as long as reasonable tire choices are made it can work.

I do have to say that to my eye, 8 & 9 x17 Cup1s look perfect on 964s
Agreed on the CUP I's but those Carrera III 5-spokes really catch my eye.

Wasn't there a steering rack support that could be used on the 964 if using 18" wheels?
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Last edited by 911URGE; 03-06-2009 at 12:51 AM..
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Unread 03-07-2009, 04:47 PM   #6
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Quote:
Originally Posted by 911URGE View Post
...Wasn't there a steering rack support that could be used on the 964 if using 18" wheels?
The 993 steering rack brace can be used w/ 964, it's a tighter fit than on 993 though
993.347.131.02 brace
999.218.103.09 8x80 bolts x2

993
Click the image to open in full size.


'90 964
Click the image to open in full size.

also fits the manual 964 rack w/o issue, but there are 2 different 964 power racks, don't know how tight the other one might be.
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Unread 04-14-2009, 02:35 PM   #7
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That support is a new one on me. Does it really make a difference with 18" wheels?
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Unread 04-14-2009, 08:50 PM   #8
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Quote:
Originally Posted by warmfuzzies View Post
Should I?

Well I have but like Marc, I wanted to have my first thread here.......roll on
Kevin,

Adrian had 18's on his C4. Then went to 19's.

Thanks for allowing me my first post.

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Unread 04-18-2009, 10:46 AM   #9
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If you are going to track it here you won't pass safety exam with 18s unless you have an aftermarket suspension.
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Unread 05-03-2009, 06:37 PM   #10
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Quote:
Originally Posted by Yellowducman View Post
That support is a new one on me. Does it really make a difference with 18" wheels?
yes, it was standard on later 993s that came oem w/ 18s
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Unread 05-15-2009, 09:57 AM   #11
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Quote:
Originally Posted by Noah View Post
Kevin,

Adrian had 18's on his C4. Then went to 19's.

Thanks for allowing me my first post.

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Hi,
Adrian never put 18 inch wheels on his C4 when he owned it. He went from 17 inch to 19 inch. However, its new owner did a few laps of the Nürburgring and broke the rear suspension (KONI).
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Unread 05-16-2009, 12:01 PM   #12
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Quote:
Originally Posted by Gyro View Post
Hi,
Adrian never put 18 inch wheels on his C4 when he owned it. He went from 17 inch to 19 inch. However, its new owner did a few laps of the Nürburgring and broke the rear suspension (KONI).
Thanks for that correction! I do remember the Koni's and - I believe - the
19's were/are Sportec. But perhaps a search is better than my memory.
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Unread 05-18-2009, 02:25 AM   #13
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Quote:
Originally Posted by Noah View Post
Thanks for that correction! I do remember the Koni's and - I believe - the
19's were/are Sportec. But perhaps a search is better than my memory.
Sportec Mono 10s with the original aftermarket KONI sports suspension designed specifically for the model year 1989 and 1990 Carrera 4.

The original 964 design provided good grip or traction using lightweight 16 inch D90 wheels, but what you have to remember that it's not the wheel diameter in itself that's the problem, it's the wheel width and wider lower profile tyres which comes with the greater diameter; and additional weight.
Wider lower profile tyres provide a larger contact patch and hence an improvement in grip, but greater resistance to changing direction. The more resistance to a change of wheel direction the greater the stress placed upon every component in the 964's wheel carrying and suspension system.
Every 964 is between 15 and 20 years old and fitting wider wheels and tyres places additional stress on already worn components. It's not just the major assemblies either, its every nut, bolt, bushing, support, mount, clamp etc etc.
Keep in mind also that just replacing struts and shocks still leaves many other components to fail under the additional stress.
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