Fabricating a leaf spring or link suspension requires precise measurements, all of which determine the basic functionality and off-road performance of your rig. So before you begin a new suspension installation, be sure to use a geometry calculator to evaluate your suspension setup. Working through suspension geometry will tell you a lot about your rig and help you determine if there are certain configurations that could cause interferences or issues. Calculations will also allow you to configure your preferred anti-squat setting and get your roll axis where you want it to be, both of which can make or break your off-road adventures.
Photo Credit: Jamey Smith
Free 3 Link and 4 Link Calculator
Over the years, our industry has seen free suspension design software come and go. In fact, most off-road community forums share links to calculators that do not work or redirect you to an undesired webpage. After some research, we found a good and reliable suspension calculator that provides 4 link (including those with travel addition) and 3 link calculators, as well as options for random setups (e.g., coil spring, leaf springs, and axles). Click here to access these 4x4 calculators. Please note, your computer will need excel or an equivalent to operate this template.
Suspension Geometry Software for Purchase
If you are on the market for a more in-depth, customizable 4 link suspension calculator, you will likely need to purchase software. Performance Trends offers a few different options, including a free trial. Take a look at Performance Trends’ calculators here.
Questions About Suspension Geometry or Installation?
Keep in mind that using a suspension calculator does not guarantee a perfect installation, but it will surely help you find a starting point and make effective adjustments. If you are in the midst of a suspension install and need some pointers, take a look at our installation tips for 3 link and 4 link suspensions. If you have any other questions about off-road parts, don’t hesitate to give Barnes 4wd a call at (828) 551-7616 or send us an email to [email protected]