The JD2 recommends, for most bends, .049 up wall thickness, which will cover most anything encountered in racing applications, I've bent some .049, with a 3" radius, and no deformity noticed, a good lubricant will help a lot, like chain lube. I also have a Parker, hand bender, that I use a lot for nerf bars and front bumpers, it has a gear rachet that helps pull the tube around the die, with a roller on it to keep from scratching the piece. Bob
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"Being old, isn't half as much fun, as getting there"! Ole Robert I! 
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