Saturday, October 19, 2013

How to Measure Lug Bolts

How to Measure Lug Bolts

Professionals use a bolt pattern gauge to measure lug bolts on a vehicle so they can determine what size wheel will fit. Even if you dont have a gauge, you can still measure your bolts with a regular ruler. Companies list wheel sizes in the format "4x4.5," where the first digit is the number of lug bolts and the second number is the diameter of a circle drawn through the middle of the bolts, expressed in inches or millimeters.

Instructions

    1

    Count the number of lug bolts on your vehicle. If it has five lug bolts, youll need to measure differently than if it has four, six or eight.

    2

    Lay a ruler across the ends of the lug bolts and measure from the center of one lug bolt to the center of the lug bolt directly across from it, if you have an even number of lug bolts. If you have five lug bolts, measure the first and third bolt, from the center of one to the outer edge of the other.

    3

    Convert the measurement from inches to millimeters, if necessary. Express the result in inches as a decimal by dividing out the fraction and adding it to the whole inches. Multiply the result by 25.4 to convert to millimeters. For example, to convert 4 5/8 inches, divide 5 by 8 to get .625. Add that to 4 to get 4.625, then multiply it by 25.4 to get 117.48 millimeters.


No comments:

Post a Comment