Measuring the centerline distance between 2 adjacent studs I get 2.625 with a scale. The formula for finding the diameter of a circle when you know the chord length is chord=d sin(c/2) with c being the central angle, 72 degrees in this case.
2.625=d sin(72/2)
2.625= d sin(36)
2.625= d (.5877852)
divide both sides by .5877852
4.466=d= your calculated bolt circle
Conclusion: My calculations are 0.034" off of 4.5" so given the margin of error in my measurement of the chord using a scale, I conclude that your bolt circle is 4.5"
Sorry I couldn't respond earlier but work and family got in the way.
__________________
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.
|