^^^^Actually not that much difference in OD between the RCF and ISF:

Stock ISF - 26" front and back

Stock RCF - 26" front, 26.6" back

285/30/19 tire - 25.8"

With the 285/30 you may experience some more dig off the line, but you'll upset the stock front to rear stagger. And the fender gap in the rear will be larger.

Also I know your preference for the PS4S. 285/30/19 is NA in that tire.

Lou

 

Yeah, I realize that. Not to go off topic, but MPS4S (XL) is my tire of choice. If 285/30 is not available, I will most likely stick with stock size.

You recommended 295/30/19, but the issue I found with it is that the 10 inch rear wheels are not wide enough as the range is 10 - 11 inches. My fear is MPS4S will not sit properly on the relatively narrow wheel and I might get the dreadful "spongy" feel in the rear.

 

^^^^I'm signing off here. As I previously pointed out, a 295/30 tire works just fine with a 10" wheel and is within mfgs. specifications. You will not hear further from me regarding this subject.

Good Luck to you.

Lou

 

Appreciate all of your input on this forum. You are a very valuable members on this forum and your recommendations are always appreciated. I have been modding cars for 15 years so after a lot of trial and error, I have become very picky about what I put on the car and how it feels.

As you can see, my tires already are just flush at 275/30 so 295/30 is another 0.8 inches added on each side so I think it might be a bit much.

 

Had the 4S on those previous 20s, and loved them to death-despite their price tag. I would've bled out for another set but.....
This is exactly why I had to choose the Bridgestone S04 Pole Position Rubber in this size because Michelin doesn't make the 4S in this size. So far Im incredibly happy with these tires! I honestly cannot make one negative comment thus far. They've shown me just as much grip, comfort -perhaps a better ride quality, and literally outstanding in the rain! I didn't find this out (No 4S) until late in the game when building my new BC Forged Wheels. And before anyone says I could've gone with a different sized tire, this matter was spoken about in detail w Dan Young from BC Forged. He flat out stated the Front Wheel was strictly made for that sized tire, and anything else would cause issues that would void anything regarding the Wheel Warranty. Since he built them to such specific measurements, I was not about to go against his advice. I only had the choice of 2-3 quality Ultra Performance Tires in the size, and I went w Bridgestone! (Having Professional Photos done once Chrome Delete finished on September 11th - Yes I planned the date that way too!)

 

^^^^Yep, I agree. I had S-04s on my ISF with modified RCF wheels (255/35/19 and 295/30/19). Luved them to death. When I went with Vossen 21s on my LC, I would have stayed with them, but Bridgestone doesn't make them in any 21" size. So I went for the PS4S (255/40/21 and 295/35/21). So far I'm very happy with them.

Lou

 

Thanks Lou... Much Appreciated !!!

I've missed the CL gang as well..

Im still rocking the IS F, with 10 years & over 170K miles

Joe Z

 

Glad to see you back.

Thread creator might want to consider this:

 

Yes from stock to modified the IS F wins

But don't worry there are solutions out there that allow the RC F to be modified just like your IS F.


Joe Z

 

I have the Joe Z exhaust on my RC F and highly recommend it.

 

I love molten RCF's!