1.
How do you measure bolt patterns on wheels?
For 4-Lug wheels, you measure from center to center of holes directly across from one another.
For 5-Lug wheels, you measure the back of one hole to the center of the second hole directly across from it.
2.
How do you measure off sets or what is also know as back spacings?
Measure the distance from the extreme back edge of rim (not beadlock) to the mounting pad. The easiest way to do this is to lay the wheel on the floor with the front facing up. Take a ruler and measure from the floor to the mounting pad. This will provide your back spacing measurement. For a detailed description select the wheel information link on the right side of your screen.
3.
How do you find spline counts on U-Joints?
To find out how many splines there are on the U-Joint you need to replace, start by drawing a line straight up and down the surface of it. If there is a flat porting with no splines turn it to the right. Count only the splines to the left of the line and double that number. This will give you a correct spline count for the replacement.
