spd579

So I love some wide wheels on my cars and I was looking the other day and I have at least a couple inches of clearance on the inside of my 18x9 +35 RPF1's between the rim and the suspension on the rear. The only problem is to fill that I would need a really low offset wheel. I'm thinking a +80 offset with a 18x11 could possibly fit. Anyone ever tried? The wheels would have to be custom of course. My math is below:

+35 18x9 sits about as flush as possible with some series rolling at the front for clearance so I wouldn't want to go out past that.

from a 9in width to 11in width is two inches that would need to be under the car so the offset would have to go up, not down.

2" x 25.4mm = 50.8 mm so 35 + 50.8 = 85.8 so I could work with a 80 possibly to make it fit.


What are you guys thoughts?

Picture shows where I sit now.

1nate7

Offset is based on center line, so you only add 1/2 the extra width to the offset number. 11" +60 (35 + 25) would have the same outer clearance as you current setup. I am running 11" +64 rear, pics in sig link. S2000Junky has some custom widened RPF1, search should bring up the info.

spd579

This makes me happy :-) I was thinking of widening my RPF1's too. How about the front? I'd like to do a square setup if possible.

riceball777

Your calculations are not correct. When you add width to only the inside you increase offset by half of the width your adding. Off set is the distance from the center of the wheel is to the hub. When you increase the width of only the inside the center of the wheel still will be different.

The widest rim for a stock rear fender is 11.5 inches wide. Off set must be in the +63ish range.

If you widen a 18x9+35 two inches on the inside then the rim will become 18x11+60. This would be perfect for a 285 or 295/30/18 tire.

Manga_Spawn

18x11 +60 you mean right?

s2000Junky

You may have an issue with a 295 paired to a 11" +60 on the outside of the fender depending on the tire manufactures specific section width measurements, since there is a quite an array depending on what tire category and brand you choose from. For sure a 285 will fit this. No more then 11.5" tire section width is really where you want to stay to avoid rubbing and then needing to pull fenders. Right now your sidewall is stretched a bit to clear, but that will likely change with a 295/11" combo in an extreme summer compound. I run mine on a 11.5" rim to offer the appropriate sidewall profile, and then run it with a higher offset of +64. You don't have that option.

Just have one of the wheel widening shops add 2" to the inside of your wheels. Typical cost is about $200 per wheel plus shipping cost. You won't be able to run a square set up in this width. But you can safely add 1" to the front and maximize a 255 section width. Possibly a 265 if you don't mind running a larger overall front tire diameter then what you will get in the back with either 285 or 295 options.