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I've been a long time bodybuilder, but never tried Crossfit. I watched some videos of Crossfit athletes use large plates of the same size as the 45 pound plates I find in bodybuilding gyms. I am wondering if the Crossfit plates are also 45 lbs? From this knowledge, I would like to gauge my comparative strength as a bodybuilder.

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All bumpers are the same circumference; you have to look at the color to determine the weight (and also figure out if it's lbs or kilos, which are used in formal Olympic competitions). –  Greg Sep 12 '12 at 4:17
Also, given that it's a women in the photo she might be using a 15kilo bar instead of the standard 20(~45 lbs). –  Greg Sep 12 '12 at 4:18
I had been wondering that too, but then started noticing more and more of that in pictures and some were marked at 25lbs. The bars still look like they're 45lbs, though. –  Salsero69 Sep 18 '12 at 17:42

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The plates in the picture are more than likely 25s. This is a photo from the 2010 CrossFit Games which, according to this thread, used these plates. They are known as "bumper plates" because they can be dropped on the ground. Watch Olympic weight lifting videos and you'll see them use similar large, colorful plates.

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They weigh as much as they weigh. Because they're bumper plates, the plate diameter remains constant, making it tougher to tell how much is on the bar. Sometimes the plates will be color-coded for how much they weigh, but sometimes they aren't. They could weigh 45 pounds or one pound or 10 pounds.

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