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Okay, I think I have a rough measurement of my "sit bones" and I'm approximately 177 mm from point to point (7 inches). I measured my bike seat and it's approximately 6.5 inches across. Are my 'bones' supposed to be supported by the seat? And if so, wouldn't I need a seat that's at least 7.5 inches across? Am I on the right track? Nine weeks until the 50 mile ride and I'm afraid I'm losing training time. Ugh.
http://i32.photobucket.com/albums/d7...eFitMethod.jpg
If that 177mm is at all accurate then it's no wonder that you are uncomfortable on a stock saddle (most of which are 130mm or maybe 143mm). I think you are right that you'll want something that width or wider. It is a wide measurement (I'm trying to be PC here, and it is normal for women to be well, wide...), so you may want to double check it before frustrating yourself trying to find a saddle in that range (as you can see from my picture, specialized saddles come in 130mm, 143mm, and 155mm).