What is the static anti-squat percentage in this 4-link design?

The Geometry Summary shows a Static Anti-Squat of 75%, and the Travel Anti-Squat is also 75% at 0.00 travel.

Where is the instant center located in this suspension layout?

The Instant Center is at 134 in on the X-Axis and 42 in on the Z-Axis.

What are the upper link coordinates in this design?

The Upper Links have a frame end at x=34.00, y=12.00, z=33.00 in and an axle end at x=0.00, y=2.00, z=30.00 in.

What roll center height does this geometry produce?

The Roll Center Height is 29 in (Travel Roll Center 29.46), with a Roll Axis Angle of 0 degrees, noted as Roll Oversteer.

What vehicle specifications are used in the calculation?

Wheelbase 112.0 in, tire diameter 42.00 in, tire rolling radius 19.50 in, vehicle CG height 43.00 in, vehicle mass 6,000 lb, and 800 lb each for front and rear unsprung mass.

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4-Link Suspension Geometry Calculator (Version B) - Anti-Squat & Roll Center

Suspension 4-bar linkage geometry diagram with plotted links, roll axis, and wheel circles

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4-bar linkage suspension geometry diagram plotting upper and lower links, anti-squat lines, roll axis, and wheels.

AI caption June 2011 · Photo 152 of 846

This document is a screenshot of a spreadsheet-based four-link suspension geometry calculator, uploaded as 'Version B' of a link design study. It defines vehicle specifications — 112.0 in wheelbase, 42.00 in tire diameter, 19.50 in tire rolling radius, 43.00 in vehicle CG height, 6,000 lb vehicle mass, and 800 lb front and rear unsprung masses. Suspension geometry is given as x/y/z coordinates for the upper links (frame end 34.00, 12.00, 33.00 in; axle end 0.00, 2.00, 30.00 in) and lower links (frame end 39.00, 10.00, 26.00 in; axle end 3.00, 25.00, 20.00 in). The computed geometry summary shows 75% static anti-squat, a 29 in roll center height, a 0 degree roll axis angle (labeled roll oversteer), and an instant center located at 134 in on the X-axis and 42 in on the Z-axis. Travel values at 0.00 in of travel show 75% anti-squat, a 29.46 travel roll center, 0.49° travel roll axis, and 0.00° pinion change. A large side-view plot graphs the lower links (red), upper links (blue), anti-squat line, anti-squat CG line, 100% AS line, roll axis, and roll center, with a small inset 'Travel' chart. Useful for evaluating a custom 4-link suspension design.

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Frequently asked questions

What is the static anti-squat percentage in this 4-link design?: The Geometry Summary shows a Static Anti-Squat of 75%, and the Travel Anti-Squat is also 75% at 0.00 travel.
Where is the instant center located in this suspension layout?: The Instant Center is at 134 in on the X-Axis and 42 in on the Z-Axis.
What are the upper link coordinates in this design?: The Upper Links have a frame end at x=34.00, y=12.00, z=33.00 in and an axle end at x=0.00, y=2.00, z=30.00 in.
What roll center height does this geometry produce?: The Roll Center Height is 29 in (Travel Roll Center 29.46), with a Roll Axis Angle of 0 degrees, noted as Roll Oversteer.
What vehicle specifications are used in the calculation?: Wheelbase 112.0 in, tire diameter 42.00 in, tire rolling radius 19.50 in, vehicle CG height 43.00 in, vehicle mass 6,000 lb, and 800 lb each for front and rear unsprung mass.