harlanmott3

I know tire size is important for the c4, but I have no idea whats I can run. I want to get some winter tires for it soon. What I currently have is..

295/30zr19
235/35/zr19

I know there is some 5% rule or something, can someone point me to how to make the calculations on this? Thanks a ton.

MY997

Good question...actually!

I recently bought a 2009 C4S and have 295/30/19 tires on the rear...but it seems everything I read is my car should have 305/30/19 on the rear. Funny thing is that they gave me the original window sheet for my car and it came with 19x11 wheels and 295/30/19 tries...wonder why my car (and now I have seen others) did not come with the 305 tires? Did you have to order the "Sport" wheels (19x11.5) to get the 305 tires? Also has anyone put a 305 tire on a 19x11 wheel?

powderzone

I use 295s on my 19x11 lobsters (winters) for my 4S.
But I have 305's mounted on my 19x12 summer rims. i think you can run the 295's on the 11.5 rim but depends if this is going to be a winter / snow tire setup.

MY997

Thanks...I assume you could run a 305 on a 12in wheel but what does a 305 look like on a 11in wheel? According to Tire places I have checked, you can do it but I would like to see it done first???

I have seen the 305 on a 11.5in wheel (Porsche Sport wheel) and it looks good.

powderzone

The 305's on a 11" rim would look a bit bulbous I think (i.e.; the tire would project out past the rim lip too far for aesthetics). Functionally, it will work but won't match the profile of your front tire/rim combo.

MY997

Thanks and yeah that is what I am thinking. I don't want my tries stretched (that hurts handling) but i don't want them bulging either.

My Porsche Motorsports shop has a set of HRE 795r (older model) 20x8.5 / 20x12 - 245/30/20 / 325/25/20 for a very good deal. Those rear 325 are massive and would look perfect on my C4S...and the wheels were ordered for a C4S and the person bailed on them (that is why the good deal as they have been sitting there). My 997 is there now having the front end sprayed (long story as Porsche scratched it and is now fixing it with no argument) and they said they would throw these on the car so I could come by and see them...I think I might at least see what it looks like??? I am just going to be hating the cost of replacing 325 tire's...LOL

PS I would keep my stock wheels for track days, autocross, etc...

Chaos

I run 245 305. 245 on ft helps with understeer

Mr Fish Tank

I got a 996 C4S with 18" 225 in the Front and 295 in the Rear
I found a set of 17" twists with winter tires 225/45/17.
Do you guys think will fit?
The clearance in the Front from the brake to the wheel is about 1"

MY997

On what size wheels?

Mr Fish Tank

17"

Chaos

19. 9. 11

FoCo

Hey MY997, did you take a picture of your car with the 325 tires on it? Just curious.

MY997

Here are the best shots I currently have of the 20x12 with 325/25/20 tire

FoCo

Thanks for sharing! Beautiful car.

MY997

Thank you very much...