What anti-squat percentage does this 4-link setup have?

The static anti-squat is 47%, and the travel anti-squat is also shown as 47%.

What are the vehicle specs entered in the calculator?

Wheelbase 107.0 in, tire diameter 37.00 in, tire rolling radius 18.50 in, vehicle CG height 34.00 in, vehicle mass 2,500 lb, and front and rear unsprung masses of 750 lb each.

Where is the roll center and what is the roll axis angle?

The roll center height is 29 in, and the roll axis angle is -7 degrees, which the calculator labels as roll understeer. The travel roll center is 28.71 and travel roll axis is -6.82°.

What are the link mounting coordinates?

Upper links: frame end x=34.00, y=14.00, z=30.00 in; axle end x=2.00, y=4.00, z=30.00 in. Lower links: frame end x=42.00, y=4.00, z=22.00 in; axle end x=3.00, y=21.00, z=19.50 in.

Where is the instant center located?

The instant center is at 167 in on the X-axis and 30 in on the Z-axis.

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4 Bar Linkage Calculator v3.0 - Suzuki Samurai Rear Link Suspension Geometry

4 Bar Linkage Calculator v3.0 screenshot showing suspension link geometry and roll-axis data

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Suspension geometry schematic from a 4-bar linkage calculator showing link positions, anti-squat, and roll-axis summary values.

AI caption September 2009 · Photo 53 of 259

This document is a screenshot of a '4 Bar Linkage Calculator v3.0' spreadsheet used to design and analyze a 4-link rear suspension. It shows vehicle specifications entered by the user: 107.0 in wheelbase, 37.00 in tire diameter, 18.50 in tire rolling radius, 34.00 in vehicle CG height, 2,500 lb vehicle mass, and 750 lb front and rear unsprung masses. Suspension geometry coordinates (x, y, z) are given for the upper links (frame end 34.00/14.00/30.00 in; axle end 2.00/4.00/30.00 in) and lower links (frame end 42.00/4.00/22.00 in; axle end 3.00/21.00/19.50 in). The calculated geometry summary shows 47% static anti-squat, 29 in roll center height, a -7 degree roll axis angle (roll understeer), and an instant center at 167 in (X) and 30 in (Z). Travel outputs list 47% travel anti-squat, 28.71 travel roll center, -6.82° travel roll axis, 0.00° pinion change, and 0.00 travel amount with a 1.00 increment. A side-view plot depicts the link geometry, wheels, anti-squat line, 100% AS line, roll axis, roll center, and instant center, with a smaller 'Travel' inset chart and a color-coded legend. Bump and Droop buttons animate suspension travel.

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Frequently asked questions

What anti-squat percentage does this 4-link setup have?: The static anti-squat is 47%, and the travel anti-squat is also shown as 47%.
What are the vehicle specs entered in the calculator?: Wheelbase 107.0 in, tire diameter 37.00 in, tire rolling radius 18.50 in, vehicle CG height 34.00 in, vehicle mass 2,500 lb, and front and rear unsprung masses of 750 lb each.
Where is the roll center and what is the roll axis angle?: The roll center height is 29 in, and the roll axis angle is -7 degrees, which the calculator labels as roll understeer. The travel roll center is 28.71 and travel roll axis is -6.82°.
What are the link mounting coordinates?: Upper links: frame end x=34.00, y=14.00, z=30.00 in; axle end x=2.00, y=4.00, z=30.00 in. Lower links: frame end x=42.00, y=4.00, z=22.00 in; axle end x=3.00, y=21.00, z=19.50 in.
Where is the instant center located?: The instant center is at 167 in on the X-axis and 30 in on the Z-axis.