Originally Posted by Werkin

Here's how you can find out on your own, place a thick piece, or two layers of cardboard on a flat surface, and sit on it with your torso leaning forward. Draw circles around the depressions left by your sit bones on the cardboard, and a vertical line through the middle of each. The distance between the lines is your sit bone width. Now you can overlay that width on any saddle to be sure there is adequate support.

If you find a fat layer is preventing discrete impressions, do something to create extra sitting force. It also may require a few extra layers of cardboard.

The distance between the sit bones is dynamic when peddling, the static measurement is only a guideline.