There are many different important parameters when it comes to car wheels, one of those being the bolt pattern. It's actually pretty straightforward to measure.

Wheel bolt-circle diameter is the diameter of a circle drawn through the centers of the wheel's mounting-bolt holes. Whether shopping for new wheels or scrounging wrecking yards for good used ones ...

That Bolt Pattern, Tho The number of lugs and the pattern they form are the first things to think about when wondering whether or not a wheel might work.

The bolt pattern is traditionally known as 5 on 5.5 or 5 x 139.70mm if you care to be all metric on us. The backspacing on the factory wheels is right at 4 inches.

However, the old-body-style Ram 1500 Classic has wheels with five holes, on a 5.5-inch diameter bolt pattern, that look similar to those on the Jeep Wrangler.

There are many different important parameters when it comes to car wheels, one of those being the bolt pattern. How do you actually measure it?