Roll Cages: Chromoly VS. Mild Steel

Yes, CM does get more brittle with time. But I have yet to see a properly welded and designed cage or bar made of it split. I think that's an "overthought" detail... In terms of costs, on a car that is double duty, CM is expensive for a savings in weight that just doesnt make sense in a car full of compromises. But on a race car, when you're paying for light brakes, glass, and various other savings, and you need more tubing... You should pay for that savings. Ialways used 1/3 for weight savings.