Due to the number of threads recently about people asking about wheel offsets and fitments, and not being able to understand them, I have made this idiots guide.
For all you people who are about to post up on this thread giving all this indepth details about it and explaining where I have went wrong - THIS IS AN IDIOTS GUIDE. Short and to the point just to help people get their heads around it initially, before they head off and do more reading around the forum.
PCD:
Pitch Circle Diameter is the diameter of a circle drawn through the centre of your wheels bolt holes.
Zeds are a 5 stud, with a PCD of 114.3
Offset:
Effectively the offset is also the distance from the centre-line of the wheel to the hub face.
Therefore :
If you put a wheel on the same hub with a bigger offset, the wheel will sit further inside the wheel arch because the wheels bolting face will have to move further in to meet the hub.
Alternatively if it has a smaller offset it will sit further out from the wheel arch.
Zero Offset - The plane of the hub mounting surface is even with the centerline of the wheel.
Positive Offset - The plane of the hub mounting surface is shifted from the centerline toward the front or outside of the wheel. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars.
Negative Offset - The plane of the hub mounting surface is toward the back or brake side of the wheel's centerline.
Zed offsets depend on how agressive a stance you want.
The OEM Rays are 8j wide, with an offset of +30.
If keeping the OEM Rays, members often fit 10mm spacers to push out the rims essentially creating an offset of +20.
When you are looking to buy new alloys for your car, the offset is important because you qill require your new wheels to clear the brake calipers. And for looks wise you want them to nicely fll the arches, and not to be lost inside them somewhere.
Here is a link to a wheel offset calculator (this link takes you to an external site that has no affiliation with 350z-uk)
http://www.1010tires.com/wheeloffsetcalculator.asp