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996 Turbo wheels and offsets driving me nuts!

T

tykes

PCGB Member
Member
I have a 2002 996 turbo that is currently fitted with some aftermarket 997 turbo style wheels with 225/40R18 tires on the front and 275/35R18 tires on the rear. I also have 17mm spacers on the front and bigger ones on the rear (can't remember the size). These wheels fill the arches and make the car look more aggressive but I am sure it is messing with the geometry and even though I like it I feel I should get back to original.
I have a set of turbo wheels however the fronts are 9J ET52 with 235/40R18 Pilot sports and rears are 11J ET45 with 295/30R18 Pilot sports
Whilst the rears are the correct size I believe the fronts should be 8J ET50 rather than 9J ET52. When I fit one of the fronts I felt they were too close to the suspension leg. If I left the spacer on they stuck out too far.
I think the 235s are 10mm wider than the 225s so with the offset difference of 2mm should I be thinking of fitting 7mm spacers or greater to the front?
Are 235/40s and 295/30s compatible in terms of rolling circumference or will this cause.
I seem to be going round in circles here so if anyone who is familiar with how all this works could chip in I would be most grateful. Can this arrangement be made to work or do I need some 8J ET50 front rims?

Many thanks to all.




 
Thanks Richard but can the 9J et52 wheels fit and if so what spacers And true size to match rears?

Thanks
 
If you fit the 9J ET52 wheels on the front without spacers, you will get 13mm less clearance to the strut, and they will extend 13mm to the outside, compared to a standard 8J ET52 wheel. Any spacer you fit will increase the strut clearance, but reduce the outer clearance by the same amount.

Unlike the Carrera, the Porsche wheel & tyre bulletins for the Turbo make no recommendation for wheel spacers on the front. I think you might be pushing the limits of what will fit. Bearing in mind that the GT2 only uses an 8.5 J front wheel, I think you will be lucky if you can get it to work at all.

Should you manage to make it fit, the correct tyre size of 225/40/18 would give you the correct rolling radius, but will be a bit of a stretch on a 9J wheel. Other than that, you could maybe find a 235 with a lower profile to give you the same rolling radius, but I think you are then going to change the handling characteristics again - and your object was to put it back to standard.

Here are a couple of useful calculators:

http://www.1010tires.com/Tools/Wheel-Offset-Calculator#
http://www.1010tires.com/Tools/Tire-Size-Calculator
 
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