i might be albe to get a set of rims and tires for cheap from a freinds dad her sold his truck but still has the rims and has 2 sizes of tires 315/75R16's or 285/75R16' and the rims but i dont know the backspacing i know stock rims have 4 1/2 backspacing need to know How to measure backspacing on the rims

the rims and tires came off a 02 F350 with the 7.3 and are going on a 02 f250 5.4 gas

thanks

 

Backspace
Back spacing is measured from the inner edge of the wheel to the hub mounting surface. It is a convenient measurement in that, as long as the back spacing remains the same, the clearance to the suspension also remains the same. If you know the width of the wheel and the offset you can compute the backspacing. For example if you have an 8 inch wheel with a +24mm offset. An 8 inch wheel is actually 9 inches wide so if the offset were 0 the mounting surface would be right on the centerline and the backspacing would be 4.5 inches. With a positive offset the mounting surface moves off center 24mm or 1 inch toward the outer edge of the wheel. This will make the inner edge go more inside which will result in a 5.5 inch backspacing.

 

thanks alot