I want to do drag style wheels, but I am confused by wheel and tire sizes. I need someone to school me up on the whole thing. I want fat ones in the back and smaller ones in the front without making any difficult mods. Can someone please help me?[8D]

 

Don't know really what you're asking for, but here's some basic info.

For a tire size of 225/50-16: 225 is the section width in millimeters. Do not confuse this with the tread width, which does not have any indicators in the size of a tire. The 50 is the aspect ratio, which is how tall the sidewall is as a percentage of the section width. IE, a 50 series tire has a sidewall height that is 50% the width of the tire (112.5 mm in this case). And, 16 is the rim diameter.

To find the diameter of a tire, divide the section width by 25.4 to convert to inches (225/25.4=8.858). Multiply that by the aspect ratio in its percentage form (8.858*.5=4.429). Multiply by 2 (you have 2 sidewalls) (4.429*2=8.858). Then, add the rim diameter (8.858+16=24.858).

For rims, you have backspacing, which is a measurement from the inside of the rim to the mounting surface of the center hub. An 8" wide rim with a 4" backspace is a centerline wheel (don't confuse the term with the company). An 8" wide rim with 1" backspace has a very deep dish, while an 8" wide rim with 7" backspace has pretty much no dish.

You also have offset, which is a measurement of the mounting surface in reference to the center of the rim. Positive offset has more backspace, while negative offset has less backspace.

Hope that helps.