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.