Wheel noob here, have a few questions!
 

I'm sure these questions have been answered various times so forgive me!

Q1: Does center bore measurements matter? The stock cb is 56.1mm and the aftermarket wheels I am looking at has the diameter of 73mm. Will this still fit? (Wheels in question: http://www.wheeldude.com/catalog/pro...oducts_id=6869 )

Q2: What is offset? I had this explained to me by a friend but I still can't quite grasp the concept. I.E. What's the difference between a large offset (40mm) and a smaller offset (20mm).

Thanks for helping me out guys! :thanks:

center bore matters in that you can't fit a wheel with a SMALLER bore onto your car if it is smaller than the hub. for your example, you can get centering rings to fill in that spacing, though some will say they are not necessary. up to you.

in a broad sense...higher offset=wheel more inset in wheel well, lower offset=wheel will stick out more. to be more specific, the offset is the distance measured from the center of the wheel. use the wheel directory/gallery to see what fitment works for your own goals here: http://www.ft86club.com/forums/showthread.php?t=7535

here's a photo to help you picture it:
https://www.lesschwab.com/images/blog/wheel-offset.jpg

@asdf Thanks for the help, one more question haha! For wheel spacers should the center bore be the same diameter of stock specs (56.1) then a rim with a cb of say 71 should fit perfectly fine on the spacer?

There are enough wheel spacers out there that you might as well get one with a 56.1 center bore. Your wheel with the 73mm bore will still fit just fine. Our wheels are lug-centric, not hub-centric, which means that they use the lugs to center themselves, so it's less important that the center bore matches up exactly. Any wheel with tapered lugnuts will be lug-centric. Wheels with bolts or flat lugnuts are hub-centric, and then it's very important that the hub diameters match, because that's how the wheel is centered.