This compresses the sidewalls of your 2wd buggy tire to glue them to the wheel. This is meant to stiffen and shorten the sidewalls. It's primarily used is 2wd buggy offroad carpet racing.
The file only contains one half of the device, but you'll need to print 2 and use 2 M3x10 screws to tighten the two halves together. Even at 100% infill this is less than an hour to print and doesn't cost more than 50 cents in plastic. This way if you strip out one side it's a cheap replacement. Plus, you can print multiple sets to do a whole fleet of tires at once.
The author marked this model as their own original creation.