6S219

This weekend I installed new rims and tires on my 997.2TT. I went from a 19 inch rim to a 20 inch rim. I kept the tire size the same, front 245 30 and the rears are 305 30.
I have a problem with the driver side wheel rubbing on the interior against the strut. The passenger side is fine. No problems with the rear. Any suggestions what might the problem might be?

JF22

what size is your front tire 245 30 20 or 245 35 20 ?

6S219

I made a mistake in the original post. Fronts are 245 35 20 and rears are 305 30 20.

JF22

IMO your tires are too big, correct size for 20 inch wheels is 245 30

6S219

thank you for the reply but why only rubbing on the driver side and not the passenger side? I can’t figure it out.

MexicoBlueTurboS

Too tall - too much sidewall. 17% more than 30 at 20" (bottom diagram)

MexicoBlueTurboS

I know... the interior of my car has these foot pedals and a roundy thing that the passenger doesn't have. WTF Porsche??? Right?

nzskater

No offence intended , but how heavy are you?...

TT Surgeon

Be sure the offset is the same for the pass side rim, I suspect one is incorrect. If they are the same I suspect the pass side will rub too as you drive it more . I also agree your tire sizes may be incorrect, potentially harmful to the front diff.
c

MexicoBlueTurboS

If I am not mistaken the part he is rubbing on doesn't change it's distance with load. So weight is not an issue.

I went through the exact same hassle on a C4S when putting on 20s - the only difference, I didn't drive on them and Discount Tire took off the 35s and put on 30s.

Sidewall is too high and yes bad on the car and can void the warranty. Read your warranties.

6S219

no offense taken. I’m 5-10 205

6S219

no offense taken 5-10 205

nzskater

As someone with an ounce of common sense pointed out, load shouldn't impact rub there so is a moot point.

Could be a difference in alignment?

wax997.2TT

Front 245/30/20
Rear 325/25/20

Full Boost

There could be an issue with the way the upright is bolted to the strut.

If it has come loose - it may have slipped down a few mm - hence why it only rubs on the one side......

Had any suspension work done lately?

Might be worth checking?

Ohh and Tyres (tires) too big for sure.

Simon