New wheels and tyres!

[adriana1]

New wheels and tyres!
Just took my 993 C4 to ATS to have the replacement wheels and tyres fitted.
The wheels I thought were originals are in fact Italian copies- no matter- the problem I have is that the fronts foul the brake calliper- just!
The wheels are 8J x18H2 PCD 130- not sure what the off set is.
As I have had new continental tyres fitted I need to get the fronts to fit- they said a 10mm spacer would bring the wheel out enough to be safe , but the studs are a bit short for the nuts- so in effect with a 10 mm space the nuts only tighten up 4.5 turns- so I guess I need longer studs!!
Can anyone suggest the best way forward?
Thanks[]

 

[T911UK]

Do not run 10mm spacers with the standard studs!

7mm is OK

 

[adriana1]

Thanks but the guys at ATS said that 10mm is needed to be safe so i guess I may need longer studs-
Can this be done? if so where can i buy them from
For the time being I have put the old wheels back on

 

[Gordon Attar]

ORIGINAL: adriana1

Thanks but the guys at ATS said that 10mm is needed to be safe so i guess I may need longer studs-
Can this be done? if so where can i buy them from
For the time being I have put the old wheels back on

Adrian

Would suggest that the guys here know a bit more about 993's than the guys at ATS! 7mm will be plenty.

 

[adriana1]

Yes I am sure you guys are right would 4.5turns be enough in the nut to secure the wheels OK

 

[clyde]

ORIGINAL: adriana1

Yes I am sure you guys are right would 4.5turns be enough in the nut to secure the wheels OK

I may be missing something here but I think Matthew is saying that you cannot use 10mm spacers with the standard studs but up to 7mm spacers standard studs would be okay. He is not saying that you only need 7mm spacers. I presume the guys at ATS have measured the additional offset needed and determined it to be 10mm - in which case the standard studs are not okay.

I know Porsche and probably others do longer studs but no idea what lengths they come in.

 

[D Ward]

Sounds like a lot of faffing a round, time & expense.
Personally I'd sell the copy wheels & buy some genuine ones or at least copys that are correct offset etc for the car

 

[T3rra]

You can fit longer studs, but if u ever change wheels again u may need 2 use open ended nuts. Or cut or change the longer studs.

I changed my studs over once, 2 run 993 16" cups on a 944 and it took a full day. Need steel open nuts 2 pull the studs in and a short scolfold pole 2 stop the hub rotating. Can get spacers that bolt on with studs fitted 2 them

4 the sake off 3mm just fit 7 mm spacer

 

[adriana1]

Yes I think that may be the way to go- checked the off set on the wheels I proposed to fit they were ET52 fronts and ET40 rear, not sure what the correct offset should be! does anyone know this?
Thanks for your help with this by the way

 

[D Ward]

Should be 52 on the front, as that's what you, so they should not need spacers, you sure ATS not fitting the wheels on the wrong way round lol
Backs should be 65

 

[adriana1]

The fronts have are 52 offset but they just rub on the calipers, the wheels i think are made by JW- and yes they have them on the right way the fronts are 8 x18 the rears are 10 x 18

 

[clyde]

Those off sets are the same as 18" wheels for wide bodied 993s but looking at your picture of the ones at the rear they do not seem to project as far out as I would expect them to. Are you sure the off sets are correct?

I don't see how they are catching on the caliper at the front with that off set unless there is a lot of additional alloy to the inside face that original Porsche wheels do not have. Or possibly because the newer Porsche calipers are not as beefy as the 993's?

Lastly, are you sure that putting 10mm spacers on the front won't cause the tyres to foul on the arches, especially as it appears that the car has been lowered?

 

[D Ward]

I think clyde is probably right and they were ment for another car.
Although have never heard of even poor copies catching on the brakes.
Probably not what you want to hear but as you got major issues on the front wheels
Your back wheels are meant for a wide body car, so wrong for your nb car
Would it not be easier just to sell them and get the correct wheels for your 993
Trying to bodge some old unknown wheels on to a old vw is fine, but on a 993?

 

[adriana1]

Guys I am taking all you say into consideration- the wheels were sold to me by a Porsche specialist in Bristol- he knows the car and said the wheels were right for it- i have checked the offset and it is defiantly stamped ET52 for the front and 40 for the back, I need to get the wheels on again and check some measurements
Thanks for all you help with this I want to get this right
Adrian

 

[matthewb]

Here are the part numbers, offsets and weights of hollow-spoke and solid-spoke wheel types for the 993 TT, 4 and 4S. These may apply to other 993 models too.

Hollow Spoke "Technology" wheels:
993.362.136.00 - ET52 - 19.95 lb (front)
993.362.140.01 - ET65 - 23.36 lb (narrow body rear)
993.362.140.00 - ET40 - 25.13 lb (wide body rear)
Have smooth spoke-backs and metal valve stems.


Solid Spoke "Turbolook" wheels:
993.362.136.01 - ET52 - 25.57 lb (front)
993.362.140.04 - ET65 - 29.32 lb (narrow body rear)
993.362.140.03 - ET40 - 31.08 lb (wide body rear)
Have a 'groove' along the spoke-backs and have rubber valve stems.


From what I understand, you have the C4 (narrow rear) not the C4S (wide rear). Therefore your required offset at the rear will be 65.

M