Git Er Dun

I'm looking at getting a set of CCW C10's and am picking out the rear rim sizes. Right now there are no 345/18" street tires for road racing so I will have to use a 335. I really want to use a CCW C10. They make 345/19's but I don't think that CCW makes the C10 in 19" so I will be stuck with a 18" rim. Can you put a 335 on a 13" rim or is that too stretched? I am thinking a 12.5" rim would be better/best but not sure.

The tires I am looking at getting are the Michelin Pilot Sport PS2's in a 335/30/18. It looks like they are best on a 12.5" rim? Here's their specs:

http://www.tirerack.com/tires/Spec.j...e1=yes&place=6

I am also looking at the Pirelli PZero Rosso in a 335/30/18...but leaning more twords the Michelins. It looks like they can be used on a 13" rim though? Specs:

http://www.tirerack.com/tires/Spec.j...e1=yes&place=7

Side note: Does anyone know of a NON Dot R compound that is a 18" that is about a 335 or 345 and would work on a 12.5" or 13" rim? Any NON Dot R compounds in a 19" that are about 335 or 345? Can you put the 18" sized slicks on a 12.5" rim?



So in summary do you think a 12.5" C10 would be the best choice for running a 335 Michelin or Pirelli and still have the ability to run a 345/30/18 if Michelin comes out with that size? Would I still be able to buy scrubs from a race team that would fit well on a 12.5" rim?

Thanks for your help!

gkmccready

I'd call and ask John@CCW. He'll tell you whether it'll fit and whether it'll work better or not. He's suggested to me in the past that some tires like to be stretched a bit, and others don't. FWIW, the C14 looks like it can be had in 19in if you wanted...

0RAAMaudio

Not exactly the same deal but I just widened my rear wheels to 12.5 for NT05 335/30/19's and consider that about perfect. I have not put the tires on yet but they wheels sure fill the area nicely(barely fit!)

95jersey

I don't see a 335 size in the spec for either tire?

Most people fit 345's all day long on a stock Z06 rim, which is 12". For example Hoosier recommends a 12-13" rim for the application.

Michelin recomends an 11.5-12.5 rim for their 345.

Save yourself some money (and weight).

spazegun2213

I have my 335's on 12's and they look juuuuuussssst riiight.

gkmccready

FWIW, John had me running 295/30r18 on 18x11 and when I was thinking of dropping to 275/35r18 for clearance reasons he suggested 18x11 there, too. And we talked about doing 18x12 for the 305/35r18 rears. Toyo R888s in my case, but there was a definite feeling that stretching the tire a bit was a good thing... to the point that the aim seemed to be to have the wheel width match the tread width.

trackboss

From what I've learned, real slicks like to be stretched and DOT tires can go either way. I ran 11 front and 12 rear when I had the R6 tires in 295 and 315. They seemed like a perfect fit, but many say they have gone faster from what I understand using 315f and 335r on the same 11/12 wheel package. I'd like to get some feedback on that from those who may have tried both.

Git Er Dun

Thanks for the comments guys. I could do the C14 in a 19" but you can only get a 19X12"...no 19X12.5's or 19X13's it looks like. I will talk to John at CCW but I probably will go with a 18X13...if that's what he recommends at least.

Does anyone see any problem with using those Michelin Pilot Sports that I posted in the first link on a 13" rim?

-Eric

0RAAMaudio

Contact patch is critically important, the more the better, as long as you can control it. To narrow a rim can cause to much sidewall flex and may take more air, reducing the patch. To wide a rim, carrying extra weight to support a tire not needing it. As in all things there is a sweet spot, a balance, make that the target, within the rule set you are under.

But, the rules, they lead to all sorts of goofy looking but effective withing the compromises they induce, really fat tires on narrower rims is quite common, so much so we have cantilever slicks in some classes, others have to live with much less precision in the handling but get around the lap faster, etc.....

When I see super wide rims and obviously narrower tires I just think somebody has put "style" over real performance, mainly that is in the "ricer" world, some times a bit of that is seen here though. Then again I think 20's on a Vette is a step away from real performance(easily arguable) and thus not really cool looking to me. I lost my way a bit and ended up with 19's on our street Vette and tried to sell them so I could go to 18's all around or at least the fronts!

I did widen the rears to 12.5 though 12 was optimal for the tires I will run I wanted to have the extra 1/2" in case my next set is wider and with the offset I have it will pull the tops of the tires over a bit to help with a slight rub I have.

Weight, as I am sure you are aware, the true enemy of real performance. Get the tire and wheel package that has the lowest weight possible within your budget and intended use, the further out from the center of the wheel, the more critical, nearly always the smaller diameter wheel will be the way to go.

Have fun

Rick

AU N EGL

13" rims need a spacer and will still rub out the inner wheel well liner

0RAAMaudio

I would, was going to in fact, put the widest front tires on possible, I sure wish I had 18's as would of widened them to put on 295's up front!

In fact, I have not driven on them yet but from all I can find, I would consider going that route, 295/35/18 and 335/30/19 if starting from scratch.

I will be running 275/30/19 and 335/30/19 on 9.5 and 12.5 Iforged Classics, by tomorrow if the tires come in today. I hope to find somebody to trade these off for a more appropriate street able track setup like I recommended above!

Rick

Git Er Dun

I will be going a 305 or 315 on a 11" C10 up front. I have T2 wider fenders in the rear (2" wider...same as the L5's) and also mini tubbing the rear...so with the right backspacing rubbing will not be an issue since we will have a lot of extra room to play with.

The T2 fenders don't require a mini tub but we are going to mini tub it anyway so that we can try to keep the inside of the tire closer to the frame to fight the oversteer tendances of the wider track width...not too close that we will be limited in the future with tires but closer than if we just did a 13" rim to work with the wide fenders only.

Does anyone know if the 335/18 Michelins Pilot Sports like to be slightly stretched? It says their "Rim Width Range" is 11.5"-12.5". However could they easily be put on a 13" rim or would they be best on a 12.5" rim? If they did go on the 13" rim then technically contact patch would improve wouldn't it?

Dreamin

John doesn't make 12.5" wheels in 18" nor 19".

Your choices are:
18x12, 18x13, 19x12 -- in his "C" series wheels.
18x13, 19x13 -- in his "SP" and "T" series wheels.

Git Er Dun

Wow guess I didn't know that...kinda makes it a done deal then hahaha. Thanks for the info. Guess I will be getting the 18X13's.