E368

So I know that 305/30/ R19 is a common "upgrade" for many owners, but it seems that not many owners widen the fronts, and keep the stock 235 size fronts.

I went to 305's in the rear, and 245's in the front, with no ill effects that I can tell.

I am currently running 305/30/19 rears and 245/35/19 fronts, which makes for a closer match of front/rear overall diameter.

Is there something that I am missing?

Thanks all.

wjk_glynn

Any perceptible change (e.g. nose points in better, shorter braking distances, etc.) ?

Thanks.

Karl.

Fined

Running:
235/35/19 - 19x9
325/30/19 - 19x12


Only thing I notice is more grip, harder to break the rear loose. Car feels a bit more sure footed and planted. I made the move shortly after getting the car a couple years ago so I can't rightly say about noticed difference with turn in or braking distance.

pilfer

Interesting, I have 245 in the front and 305 in the rear. I think the rear tires could be meatier for sure. I have wider BBS CL wheels but there is sos much space in the wide body cars. Might wait on that until after I get coil over suspension, currently running Eibach springs.

Presto

pilfer

I can't tell as I had crap Bridgestone's swapped to PS4S when I got the new wheels. The Michelin tires are far superior in my opinion.

Meursault88

I am going to be on 245s in front but it won't be an apples to apples as I am also going 19 to 20 and to a different tire (Invo) after Pete's input. Lastly, I am not expert enough or push the car enough to make any comments unless the differences are striking.

Petza914

I think on my next set I'm going to run a 245/35-19 on my 8.5" wide fronts and a 325/30-19 on my 12" rears. Both are available in the Nitto Invo which is my tire of choice.

E368

Hard to answer as when I bought the car earlier this year it had dry rotted front 235/35's and okay 305/30's, PS2's all around, but opted to replace all 4 anyway. Since I knew that the 305 rear is already a plus size over stock, it just made sense for me to plus the size of the fronts to equal it out a bit. Even still, the fronts are a smaller diameter than the rears, just not as drastic as 235's.

This car will most likely never see the track anyway so I doubt I will ever notice any ill effects. One positive for me was the additional rim protection from the 245's.

Also, I must add that I am not a fan of the stretched tire look; I like the looks of a tire that appears to be just a bit wider than the rim. Not excessively wider, but just a bit.

I am running 8.5" front 11.5" rear rims.

Of course, every tire mfg is going to be a little bit different in size, so that matters too. I am currently running the General G-Max RS all around and are happy with them as far as daily driving goes.

jamesinger

One thing I will say as someone who just got new PS4S a few months back was 305s seem like no issue on the rear of my C2S Lobster FORKS. FORKS!
However, I used to mount tires and I was watching my friend mount the 235s on the front and they seemed wide for the stock rim. What I mean by this is a 245 would be pushing it to me but if other people have done it, I might be wrong. I wanted to go 245 in front but I didn't find other people running that size on the 997.1 C2S Lobster FORKS.
My fantasy is to get wheels that will let me run 255s or so in front and maybe even like 325 rears.
I will just leave my favorite picture here (sadly of someone else's car but someone from rennlist!)
https://rennlist.com/forums/997-gt2-...-hre-r101.html
Specs:
18x9.5 18lbs. 265/35/18
18x12 19lbs. 335/30/18

I would definitely run 18s to stuff this much rubber into the wheel wells of a NB 997.

E368

As far as I know, the front Lobster Forks are 8.5" wide, so the same as the Sport Classics. I just took some quick pics of my 245's on the front, albeit dark outside, hope this helps.

quickxotica

Beware that not all manufacturers' tires measure out the same way in reality. A 235 from company A might turn out to be within a few mm of a 245 from company B. With so much variability between brands/models/compounds/quality, I would choose your tire make/model first (whatever suits your usage & budget) and go with whichever correct size they offer for your wheels. It would be false economy to install a set of 4 lesser tires just because the front fitment says 245 on the sidewall. That's not a guarantee such tire will actually put a larger/better/grippier contact patch on the road than a 235 from a superior manufacturer. Much more significant are the other characteristics of the tire (materials, weight, reliability, feedback, predictability, wet traction, etc, etc, etc), all of which should outweigh a "claimed" 10mm difference in the width.

Dymag

C4S with front 245/35 on 9x19 and rears 315/30 on 12x19

Mario Vargas

Hello Dymag

I have a 997.1 meteor gray, and I was wondering: Do you have any kind of problems with these tires? do they rub or have to roll the fenders? ... is the car lowered? do you have any spacers?.....just gorgeous .... thank you for sharing.

vern1

The 305's are not "a plus size over stock". I believe all C4 and C4S's came with 305's as stock

I understand the only advantage to 245 vs 235 on the front is to try and dial out a bit of the understeer built in to the car with the factory set up. If you are not pushing your car i to understeer situations then you are never going to feel the difference in sizes