Correct size tires for 19x11 rear rims

[ttdeats]

I'm getting conflicting info from different wheel shops on the correct tire size for my new 19x11 rear rims on a 1999 P996 C2. My C2 has been lowered with H&R springs, so it sits approx 1.5" lower in the rear. Currently I have 285/30/ P-Zero's installed on these new rims, however the tires are really stretched out on the sidewalls (see photo). I've asked three different speed shops and all of them have suggested different tire sizes. The first shop said 305/30/19, the second said 295/19/30 and the last shop said 315/25/19. The last shop said the 315/25/19 closely matches the correct tire/rim diameter, however I'm worried the 315/25's are too wide for my rear fenders.

If anyone is running 19x11 rear rims on your C2, please let me know what size tires your rolling on

Thanks so much,

Edited January 28, 2008 by ttdeats

[fastboydave]

Surely the "11" of 19x11 means its a 295 fit?? But, if you want a bit extra 'protection' for your rims (with curbs), why not go for the middle of what has been suggested?? You are correct though, watch they dont catch your rear wings............

[mr gsr]

I run 295/30/18 (Contact 2's) on 18x11 (63mm offset) on my Mk1 GT3... I have about 1.5mm gap between the tyre and guard lip with the suspension compressed. My rear guards are not rolled either.

Any wider tyre would require guard rolling and you would have to watch the rear suspension cross member, which I have around 5mm clearance.

[whs]

On a 11x18 wheel, Porsche recommends either a 285/30 or 295/30 tire according to the TSB. Not sure that the tire width would be any different on a 19 inch wheel. However, you may have clearance issues using these profiles on a larger wheel. Have you tried fitting the wheels on your car as is? Do you have clearance/rubbing issues?

Just looked at the TSB for a 997 and the only tire they show for a 11x19 wheel is a 305/30/19. This is for a 997 C4 and C4S.

Will

Edited January 28, 2008 by whs

[Loren]

This is for a 997 C4 and C4S.

Yes, those are for widebody cars and have different offsets.