offset on wheels

ocal21

ocal21

iS VIP
iS VIP
Location
Boston, MA
Car
2012 FX35
Name
Oscar
Ok guys i have a question maybe someone can help me out. I was looking to buy some 22" rims and when i talked to the sales guy he told me that the offset on the wheels was 30 so it would not be good for the car because they will stick out. However when i looked online on bigwheels.net the website showed that the offset of 30-42 would fit nicely on the car. Can anyone tell me what they think the salesman meant by saying they would not be a good fit.
 
Its important to know the width of rim and tire size to determine maximum offset that will fit. Keep in mind that the lower the offset # the further out the wheel will set. I am running 22X9 with 265/40/22 Hankook RH06 tires and my wheels have a +15 offset.
My wheels are flush with the body and I'm dropped with H&R springs and have no rubbing issues whatsoever. Allot of the guy's have less of an offset on their wheels and use spacers to move the wheels out to be flush however if you achieve being flush with the offset on the wheels you will have more lip.
 
offset without knowing the width of the wheel is not determinable... the offset is directly related to the width of the wheel. a +30 on a 9.5" wheel is nothing like a +30 on an 8" wheel

offset simply means how far from exact center the wheel will sit... in simple terms to explain it clearly, take the factory wheel as an example... it is 8" wide & +40 offset... now realize that a 0 offset would put this wheel exactly centered, so at a 0 offset the wheel would be 4" extended inside & 4" extended outside from this center line , simple. a +40 means that the wheel is pushed IN 40mm further than exact center. if we roughly round off 40mm to 1.5" then at +40 on an 8" rim we would have 5.5" inside & 2.5" outside... this is why to figure out offset you have to know the wheel width... also +40 is not exactly 1.5", just used for explination, to really get it right then you'd want to be more exact
 
ocal21 said:
Ok guys i have a question maybe someone can help me out. I was looking to buy some 22" rims and when i talked to the sales guy he told me that the offset on the wheels was 30 so it would not be good for the car because they will stick out. However when i looked online on bigwheels.net the website showed that the offset of 30-42 would fit nicely on the car. Can anyone tell me what they think the salesman meant by saying they would not be a good fit.
Click to expand...

Dependent on the width of the wheel. 22" by X".

Some offsets are aggressive (i.e. stick out far), others are tucked in (i.e. stick in too far). OEM is 20x8" on +40 mm offset.
 
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I think I finally understand offset now really well. Just came up with this, imagine the face of the wheel always stays still, and the barrel moves in and out along the face of the wheel depending on the offset. A high number like +40 means the face of the wheel is at the edge, like OEM. A low offset like +0 means the face sits in the middle of the barrel, and there's more lip to see.

Turbocad's explanation really helps, and is how I came up with this.
 
Thanks alot guys for all the info on the offsets now i understand it better. When i looked earlier thru the threads i really did not understand the whole thing. But thanks to all you guys and how you guys described it, it helped.
 
so many guys get baffled with offset but it really is quite simple... on the fx itself the center point of reference is exactly at the mounting surface of the wheel, the face of the rotor/hub... on the wheel the center point is the rear face of the wheel center, where it meets the hub/rotor.... how ever much this rear face of the wheel mounting surface differs from exact center of the whole wheel is offset, + means offset to the inside... your analogy of the wheel center staying in place while the barrel moves in & out is essentially correct, like viet says technically not the wheel center, but the mounting surface which of course is part of the wheel center...

to take this one step further you can see how a 10" wheel with a +40 offset would be exactly the same as a stock 8" with the same +40 offset, EXCEPT the 10" wheel will stick out an extra inch(25mm) & also stick IN the same 1"(25mm) because it is centered the same +40... had you wanted to use a 10" rim AND if you wanted to have the outside sit exactly where the stockers sit now, then you would have to add +25mm(1/2 the difference in width) to the offset to have it be the same at the outside, so technically a 10" rim with a +65mm offset would sit exactly where the stock one sits at the outside lip... again, it's generally thought to be best to space the wheels out a bit from the stock position which is a bit tucked...

in general to get a flushish fit you want the outer lip to be ~20-25mm more than stock, so armed with this knowledge & knowing the factory fitment it's pretty simple to calculate offset & what it will do to fitment...

it is generally accepted that the stock fx wheel fitment can take up to another 25mm or so sticking out to be considered ~flush, so a 10" wheel with +40 offset would give you a flush fitment, stick out 1" past stock fitment, & also stick in the same 1", which there is enough room for...
 
I have 22" x 10" wheels with offset +30mm... It fits perfectly fine. No rubbing. It does stick out like 3cm both front and back. It is more flush look than OEM.

It depends whether you want a flush setup or a OEM style.
 
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