What anti-squat percentage does this 4-link setup have at static ride height?

The Geometry Summary shows 103.958% anti-squat at static, increasing to 118.292% in the bump condition.

How long are the upper and lower links in this calculator?

The upper links are 57.697 inches long and the lower links are 54.019 inches long (link length).

How much does the pinion angle change over the modeled travel?

With a travel amount of -6.00 in (6.00 in increment), the pinion angle change is -5.40 degrees.

Where is the instant center located at static ride height?

The instant center is at 67.013 in on the X-axis and 21.623 in on the Z-axis at static; in bump it moves to 66.881 in X and 22.872 in Z.

Does the roll axis produce roll understeer or oversteer?

At static the roll axis slope is -0.0326 in/in (-1.867 degrees), indicating roll understeer; in bump it becomes 0.0809 in/in (4.626 degrees), indicating roll oversteer.

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4 Bar Linkage Calculator v3.0 - 4-Link Suspension Geometry & Anti-Squat Data

4-Bar Linkage Calculator screenshot with suspension geometry plot and data tables

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Suspension 4-bar linkage calculator screenshot showing a link-geometry schematic plot beside numeric geometry data tables.

AI caption March 2012 · Photo 108 of 157

This document is a screenshot of a spreadsheet-based '4 Bar Linkage Calculator v3.0' used to design and analyze a four-link rear suspension, uploaded to a 1987 Ford Ranger gallery. It shows link geometry inputs and calculated outputs for both static ride height and a bump (compression) condition with -6.00 in of travel and a resulting pinion angle change of -5.40 degrees. For upper and lower links, it lists frame-end and axle-end x/y/z coordinates, link vectors, lengths (upper 57.697 in, lower 54.019 in), unit vectors, intercepts, roll points, slopes, and link forces (2473 lb static, 1682 lb in bump). Geometry summaries report anti-squat (103.958% static, 118.292% in bump), roll axis slope and angle (roll understeer static, roll oversteer in bump), roll center height (30.662 in static, 24.571 in bump), and instant center locations. A plotted side-view diagram visualizes the linkage, tires, instant center traces, anti-squat lines, and roll axis, with Bump/Droop buttons. Lower tables provide side-view tire path coordinates at 15-degree increments, IC trace coordinates, anti-squat line points, 100% anti-squat line, roll axis points, and top-view link coordinates. A reader can learn the exact 4-link geometry values being modeled and how anti-squat and roll behavior change through suspension travel.

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Frequently asked questions

What anti-squat percentage does this 4-link setup have at static ride height?: The Geometry Summary shows 103.958% anti-squat at static, increasing to 118.292% in the bump condition.
How long are the upper and lower links in this calculator?: The upper links are 57.697 inches long and the lower links are 54.019 inches long (link length).
How much does the pinion angle change over the modeled travel?: With a travel amount of -6.00 in (6.00 in increment), the pinion angle change is -5.40 degrees.
Where is the instant center located at static ride height?: The instant center is at 67.013 in on the X-axis and 21.623 in on the Z-axis at static; in bump it moves to 66.881 in X and 22.872 in Z.
Does the roll axis produce roll understeer or oversteer?: At static the roll axis slope is -0.0326 in/in (-1.867 degrees), indicating roll understeer; in bump it becomes 0.0809 in/in (4.626 degrees), indicating roll oversteer.