Finally put my wheels on. Savini BM12s in matte black.

 

Feeding the baby

 

Even though they look great imo, the back tires rub when I hit dips and road bumps. I have 20x10 niche wheels with 275/30/20.
Do you all think that If I change the tire to 255/30/20 it will stop rubbing? Please let me know.
Thanks guys!

 

I guess one of the first questions is what size rim/tire do you have on the front?
It's nice to say that if you put the 255 on the rear it will stop rubbing, but then you don't want the rear wheel assembly to have a smaller circumference than the front...it will look, and possibly drive, weird.

 

Hey, thanks for the response. The front ones are rims 20x8.5 with tires 245/30/20

 

Good tire size choice for the front.
The 275 you have on the rear is an ideal choice for the size rim you have.
I'm not sure where it's rubbing, inside, outside, or both, but reducing the tread width may help with it.
A 255/30/20 tire is ideally designed for a rim that is 8.5 to 9.5 in width...optimum width being 9 inches.
A 265/30/20 tire is ideally designed for a rim that is 9 to 10 inches width...optimum width being 9.5 inches. So really your 275 is the right tire size.
However, with a 265 you would have a very slight stretch...but picking a tire with a smaller tread width will also help.
No two 265 tires are the same when we look at manufacturer to manufacturer.
Tirerack.com is a good source to see the specs on a tire. This is the spec for a Dunlop SP Sport Maxx GT (for an example):

You can look up your current tire and see the "Spec" like above, paying attention to your 275 "Tread Width".
Then look up a few different 265 and see what their "Tread Width" is. If you are replacing the rear tires, you want to maximum getting one with the smallest "Tread Width" in best hopes of stopping the rubbing.

 

The rubbing is on the outside because the tires are a bit tucked in so it's rubbing the outer part of the tire.
I am on 20's with an +40 offset on RSR downs. I was worried about 255/30/20 being too stretched. I'm not sure if the delinte tires I have come in 265/30/20.
Idk what I'm going to do. I will keep you all updated.

 

this is my back tire as we speak. see attached.

 

Option B is looking for a 255 tire that has a large Tread Width instead of a 265 with a small Tread Width.
it's nice having all 4 tires the same brand, but having the same brand tires on the same axle is still ok...at least where I am. I'm not sure if where you are there are different rules.

 

Can somebody help me if this is too agressive to run on 3IS 2014 F Sport IS350. I'm on stock suspension right now. I think the rear is fine but the front i'm not too sure.

Advan Racing TCIII
5x114.3
18x9 +25 F
18x9.5 +45 R

The original tires on the cars are 255/35 F, 265/35 R (Tires are done. just for reference)

Thanks!

 

My personal opinion is that the front rim doesn't have enough offset and the rear has too much.
+32F and +40R would be ideal....having said that, adding a small spacer to the rear would fix the offset.
On the vehicle it would still look like the front wheelbase is wider than the rear...which to me would look odd.

 

ok thanks,

What about 18x9.0 +45 / 18x10 +35 same wheel from another source,+45 seems a bit much on the front this time..

 

The +45 would be tooo much...it would fit but it would look like the fender swallowed the wheel.
The +35 may not be enough on the rear, it might rub on the fender. A +40 would be better, or +45, or something in between.

 

I've tried to contact Rohana via FB and email but can't get a response from them. Do you know what offset's will be available for the new RFX7 in 19x8.5/9.5?... Does Rohana offer custom offsets?

 

At the moment, no news on the 19" sizing but if 19x8.5 and 19x9.5 does come in, it will most likely be available in their usual 19x8.5 +35 and 19x9.5 +40