What is the lowest offset we can go in the front? ('14 IS250 F Sport). I don't care about the fenders cause I rolled/pulled them just need to know if it'll clear the brakes

 

Good question...depends on how wide the rim you want to put on is.

8, 8.5, 9, 9.5???.

 

9.5 fronts, rears don't matter since the brakes are smaller

 

I had a +20 in the front and it cleared.I think anything lower than 25 you should be fine.

 

Really? Cause I was looking at 18x9.5 +23 and the company is telling me it won't clear the brakes, except for one of their reps lol idk who to believe

 

Rim design also plays a factor. The IS250 has the smaller brakes when compared to the front of the IS350, so clearance of the brakes on the 250 is usually not a great concern.
As the offset gets smaller the concern is that the tire will rub on the fender, as the outer edge of rim gets closer to the outside of the wheel well.
For my winter tires I run 16" steel wheels on my 250 and I clear the front brakes no problem...don't know the offset though, but the steel wheel is nothing special.

 

Check out Forgestar F14 Super deep, that's what I want. And again I don't need to worry about fenders since I rolled and pulled them. I just gotta make sure they'll clear the brakes

 

When you think about it, as the offset number gets smaller it moves the rim body outwards as the face moves in, so this will create even more room for the brakes.
If you rolled and stretched the fender already, I see no reason why the +23 won't fit.
As the offset number gets larger, then you need to worry about clearing the brakes and hitting the inner fender/suspension.

 

Really? I thought lower offset means more concave which sits closer to the hub. And the brakes?

 

You are correct, the lower offset means more concave. But keep in mind the center of the rim is what mounts to the hub of the vehicle, and depending on the rim design/pattern, that will really determine if the rim will contact the brakes, as well as the diameter of the rim.
At 18" (F14), which is the stock F Sport rim diameter anyways, you can be assured it will clear the brakes from that perspective.
Here is a definition and pic that might help to visualize offset:
The offset of a wheel is the distance from the mounting surface of the wheel to the true centerline of the rim. A positive offset means the mounting surface of the wheel is positioned in front of the true centerline of the rim / tire assembly. This in effect brings the tire in to the fender well more. Conversely, a negative offset means the mounting surface of the wheel is behind the true centerline of the rim / tire assembly. This will cause the tire to stick out away from the vehicle.

Worst case if the rim is going to hit the brakes, then adding a very small spacer (maybe 5mm), will help to push the wheel assembly away from the brakes and let you keep the concave of the rim design.

 

Ahh I see that makes sense now haha thanks

 

All of Forgestar's wheels clear big brakes. That's why I got a set lol.

 

Forgestar F14 Super Deep Concave available width listed with their offset range.

18″
18×9.5 offsets from -25 to +23
18×10 offsets from -19 to +30
18×11 offsets from -6 to +43
18×12 offsets from +6 to +55

As mentioned in your other threads.

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As we keep going back and forth... 18x9.5 +23 is the highest offset Forgestar can mill down to. You asked if 18x9 is available.. I sent you a link to forgestar F14 main page so you can see the width and offset ranges offered in each of their concavity profiles

Its easier if you just call in with questions. You can reach my direct line at (562)275-8268

 

with the 20 offset, did you rub when turning/locked out?