Found this cool site that lets you see the difference between tire/wheel sizes. It's a variation of one that was posted previously, but I think this one is better... Custom rims, wheel tire packages for your ride - RIMSnTIRES.com This could sure help noobs, I know it helped me visualize the differences. It also helped me learn more about how to measure and calculate offset. I had to figure it out myself because my rims dont have the offset stamped on them.