The bars are going to be the same thickness unless you move to another type of bar, a normal 7 foot Olympic bar is going to be 44/45 pounds just like the one you showed. 500 pounds is the standard, they will hold more but you may damage the bar. I've had 600 on one and it bounces around quite a bit.



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Plenty of people in my gym use those standard bars for 315-500lbs squating.

