measuring sit bones

[TxDoc]

I've been fitting women (and men) on Specialized saddles for over a year now. I have a saddle demo program with my bike fits. I'd say 60% of the women I fit on a 143mm saddle, 30% on a 155mm and 10% on a 130mm.

10% only?
I guess I belong to the minority!!! My saddles are 124 and 130...

[dianne_1234]

Found this in my old uni notes and wanted to post it here for easy reference:

Ischial Tuberosity Spacing among women:
5th percentile 112 mm
50th percentile 130 mm
95th percentile 148 mm

Ischial Tuberosity Spacing among men:
5th percentile 100 mm
50th percentile 118 mm
95th percentile 137 mm

I don't remember the population this data was taken from, but I remember being under the impression that it was a very large number of individuals and it was considered "safe" to assume it might represent the whole world.

I've used this info to help narrow the search - once I learned I was wider the 95th percentile(!) I stopped bothering with a lot of narrow saddles.