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there is this old wives tale (and personally I've always believed those old wives tend to be pretty sharp) , that your bicycles contact patch to the road is a fulcrum. Think of your bike as a lever. You will gain maximum benefit from reducing weight toward the end of the lever. Saddle, seat post, potentially handle bar tape should offer maximum reduced cost for maximum benefit. Forget rotational weight, fulcrum weight could be where it's at. And of course, your body is the heaviest and highest part