If you’re going racing, you need a roll cage . But there often isn’t an off-the-rack option that meets the requirements of the series you plan to race in—one that provides adequate protection and actually fits in your car. Get the design wrong, and you’ll waste a lot of time and material. Now there’s a free online tool to help ensure that doesn’t happen.

Frog Racing , a Massachusetts-based nonprofit that promotes motorsports, has a number of helpful guides and tools for aspiring racers. One of them is its roll cage assessment tool , which can build a virtual roll cage based on parameters you specify like the tubing, welds, and layout, and…

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