What is the static anti-squat percentage shown in this 4-link calculator setup?

The static anti-squat is 56%, and the travel anti-squat at 0.00 travel is also 56%.

What roll center height and roll axis angle does this geometry produce?

The roll center height is 29 in and the roll axis angle is -1 degrees, noted as roll understeer. Travel values are 29.31 for roll center and -0.50° for roll axis.

Where is the instant center located for this suspension geometry?

The instant center is at 232 in on the X-axis and 53 in on the Z-axis.

What vehicle specifications are used in this calculation?

Wheelbase 112.0 in, tire diameter 42.00 in, tire rolling radius 19.75 in, vehicle CG height 42.50 in, vehicle mass 6,000 lb, and 800 lb each for front and rear unsprung mass.

What are the link mounting coordinates entered in the calculator?

Upper links: frame end x=30.00, y=11.50, z=33.00 in; axle end x=0.00, y=2.00, z=30.00 in. Lower links: frame end x=38.00, y=9.70, z=25.50 in; axle end x=3.00, y=24.50, z=20.50 in.

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4 Bar Linkage Calculator v3.0 - Four-Link Suspension Anti-Squat & Roll Center

4 Bar Linkage Calculator v3.0 spreadsheet showing suspension geometry plot and summary values

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Suspension geometry calculator spreadsheet plotting upper and lower link positions with anti-squat and roll-axis summary data.

AI caption July 2011 · Photo 160 of 846

This document is a screenshot of a spreadsheet-based "4 Bar Linkage Calculator v3.0" used to design and analyze a four-link suspension. It shows vehicle specifications entered by the user: 112.0 in wheelbase, 42.00 in tire diameter, 19.75 in tire rolling radius, 42.50 in vehicle CG height, 6,000 lb vehicle mass, and 800 lb front and rear unsprung masses. Suspension geometry coordinates (x, y, z) are given for the upper links (frame end 30.00, 11.50, 33.00 in; axle end 0.00, 2.00, 30.00 in) and lower links (frame end 38.00, 9.70, 25.50 in; axle end 3.00, 24.50, 20.50 in). The calculated geometry summary at static position shows 56% anti-squat, a 29 in roll center height, a -1 degree roll axis angle (roll understeer), and instant center location of 232 in (X-axis) and 53 in (Z-axis). Travel values match static (0.00 travel amount): 56% travel anti-squat, 29.31 travel roll center, -0.50° travel roll axis, 0.00° pinion change. The plotted diagram shows the upper links (blue) and lower links (red) converging toward the instant center, with an inset "Travel" chart and a legend for Lower Links, Upper Links, Anti-Squat Line, and Anti-Squat CG. Bump and Droop buttons allow simulating suspension travel.

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Frequently asked questions

What is the static anti-squat percentage shown in this 4-link calculator setup?: The static anti-squat is 56%, and the travel anti-squat at 0.00 travel is also 56%.
What roll center height and roll axis angle does this geometry produce?: The roll center height is 29 in and the roll axis angle is -1 degrees, noted as roll understeer. Travel values are 29.31 for roll center and -0.50° for roll axis.
Where is the instant center located for this suspension geometry?: The instant center is at 232 in on the X-axis and 53 in on the Z-axis.
What vehicle specifications are used in this calculation?: Wheelbase 112.0 in, tire diameter 42.00 in, tire rolling radius 19.75 in, vehicle CG height 42.50 in, vehicle mass 6,000 lb, and 800 lb each for front and rear unsprung mass.
What are the link mounting coordinates entered in the calculator?: Upper links: frame end x=30.00, y=11.50, z=33.00 in; axle end x=0.00, y=2.00, z=30.00 in. Lower links: frame end x=38.00, y=9.70, z=25.50 in; axle end x=3.00, y=24.50, z=20.50 in.