Editing Wheel bolt pattern (section)
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==Measuring bolt pattern or bolt circle== [[File:Wheel pcd1.jpg|400px|right]] Pitch circle diameter (PCD) or bolt circle diameter, means the diameter of an imaginary circle that goes through the center of each of the bolt holes of a wheel. The wheel stud bolts are fixed to either the brake drum or the disc brake rotor and protrude through the wheel when it is mounted to the drum or rotor (there are a few vehicles that use wheel bolts instead of fixed studs and lug nuts, old MOPAR and VW are two. <table style="float: right;" border="1" cellpadding="2" cellspacing="0" width="275"><tr bgcolor="#CCCCFF"><th colspan="2">'''Conversion Table'''</th></tr><tr bgcolor="#FFF8DC"><th class="head">'''Inches'''</th><th class="head">'''mm'''</th></tr><tr style="text-align:center"><tr><td>4 x 3.93</td><td>4 x 100</td></tr><tr bgcolor="#eeeeee"><td>4 x 4.25</td><td>4 x 107.95</td></tr><tr><td>4 x 4.33</td><td>4 x 110</td></tr><tr bgcolor="#eeeeee"><td>4 x 4.50</td><td>4 x 114.3</td></tr><tr><td>4 x 5.12</td><td>4 x 130</td></tr><tr bgcolor="#eeeeee"><td>4 x 5.51</td><td>4 x 140</td></tr><tr><td>5 x 4.00</td><td>5 x 100</td></tr><tr bgcolor="#eeeeee"><td>5 x 4.25</td><td>5 x 107.95</td></tr><tr><td>5 x 4.50</td><td>5 x 114.3</td></tr><tr bgcolor="#eeeeee"><td>5 x 4.53</td><td>5 x 115</td> </tr><tr><td>5 x 4.72</td> <td>5 x 120</td></tr><tr bgcolor="#eeeeee"><td>5 x 4.75</td><td>5 x 120.65</td></tr><tr><td>5 x 5.12</td><td>5 x 130</td></tr><tr><td>6 x 5.5</td><td>6 x 139.7</td></tr></table> The PCD can be expressed in mm or inches. The PCD can be found on any 5 lug wheel by measuring from the center of the wheel (the axle hole), to the center of one of the wheel stud holes, and then multiplying that measurement by two. This is difficult on the 5 hole wheel because it is hard to judge the exact center of the large axle hole in the wheel. to measure the bolt pattern on a five lug, you need to ignore the diagram and measure from one wheel stud to the second one away from it, you must skip one, not measure the distance of adjacents studs. the diagram is incorrect. It may be easier to check this measurement by placing a straight edge across the outer edge of two of the wheel bolt holes. Then measure from the center of the wheel hole that is opposite the two holes that the straight edge touches, to the inside (closest) edge of the straight edge. In other words you are measuring the distance from a straight line touching the outside of two wheel bolt holes, to the center of the opposite wheel bolt hole. This will be easier to actually measure since you don't have to guess where the center of the large hole in the wheel is, and will closely approximate the diameter of the imaginary circle (PCD) passing through all of the wheel bolt holes. On a 4 lug wheel, determine the PCD by measuring across the center of the wheel, from the center of one lug bolt hole to the center of the opposite lug bolt hole. If you were to see an advertisement for wheels that read: "'''5 x 4.75'''" OR "'''5 on 5'''", it would mean the wheels have 5 holes arranged in a 4.75 inch diameter pattern. This pattern could also be expressed as '''5 on 120.65 mm'''. Typically, a wheel bolt hole measuring tool would be the most accurate to measure with but an ordinary tape measure either in inches or mm will get you by. Just remember the two ways of measuring as detailed above. Four bolts are usually measured across from bolt hole center to bolt hole center. Five bolt holes as stated above. Six or eight bolt patterns are usually wheel center to bolt hole center times two.
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