Inliners International Forums General Discussion Tech Tips Acceptable thickness for 2X3 rectangular tubing?

I think for drag racing, the minimum thickness allowed is .137 thick. But for street use, you actually need to go thicker, maybe 3/16". Street cars take a lot more twisting and flexing in day to day driving than a race car does, and that can fatigue tubing if its too thin. You aren't talking that much more weight either if its just for the main rails.