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In the Roll Center Calculator and Circle Track Analyzer, how do I measure where the Frame Mounts for the A Arms are located?

April 26, 2017analyzer arms calculator center Circle frame measure mounts roll track

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In the Roll Center Calculator and Circle Track Analyzer, how do I measure where the Frame Mounts for the A Arms are located?

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10 Posted

We often get this question. This is a limitation of doing a front suspension layout in 2 dimensions (like a flat sheet of paper) compared to doing it in full 3 dimensions (3D) like done in our Suspension Analyzer. This is best explained with the picture below. Draw a line connecting the left and right ball joints. We call this the “axle line”. Draw a line connecting the front and rear frame mounts. Where these 2 lines intersect, that is what the 2 D programs want for a frame mount point. Both the X Right/Left (distance out from the car centerline), and Y Height (distance up from the ground) are measured at this point. (click image to enlarge v3.6 “More Details” screen shown here) Click on blue link to view the “More Details” screen available in v3.6 of Circle Track Analyzer and Roll Center Calculator to precisely locate this single point based on the 2 actual mounting points.