Vncool

For some reason, reading my specification on my 2003 Porsche C4S, the rim spec as follow:
Front 8J x 50 with tire size 225 40ZR 18
Rear 11Jx45 with tire size 295 30ZR18
And I am planning to replace with Rim/tire below
Front 7.5J x 50 with tire size 225 40ZR 18
Rear 10Jx55 with tire size 265 ZR18

They both have the same bolt pattern..5x130...
Is this still fit in my car or it's completely different rim/ tire

Your expert comment /advise would greatly appreciated
Thanks

tokyopav

Why do you want smaller rims and tires?

Vncool

I got a good deal on a set of wheel and tire...I thought I could fit the car for now...if it's doesn't look right on the car then I should leave what I got which is the turbo twist 18" rim.

alpine003

The wheels you got are from a narrow body mk1 car most likely. You will need 10mm spacer in the back with longer bolts if you want it to look right.

Next time try to get something that fits AND that's a good deal.

Spinout

Going to a smaller rim size will result in a larger gap between the wheel and the fender. To make up for this you'll need to increase the height of the sidewalk which isn't recommended as it will affect your handling with more sidewall flex.

Additionally, modifying the overall wheel tire diameter will affect your speedometer and odometer readings.