Ok I don't know about all this technical information but...
I was on 165 cranks (and a triple) and then moved to a 170 crank (double) and my knee pain is GONE. Totally gone, AND, I now have considerably more power and spinning is coming much more naturally.
Like I said, I don't know about all the technical gab but this bike fit stuff is all sort of mystical and at some point you just have to buy a bike (and at this price point its gonna be a nice one!). If its not perfect you switch out cranksets. Big deal. Thats a $200-500 change out if you buy the crankset on ebay, and even less if you then turn around and sell the old (almost new) one.
Miranda, I was in this same boat. Wanting my new bike to be JUST perfect. And you too will find at some point its a leap of faith. You're new ride is going to be SUCH an improvement over the current bike that you'll be amazed any way you go.



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... see the bike specs in this link below:
. Your post made me let out a BIG *sigh*. My buying experience with the shop was not so great with the bike I have now. It made me a tainted buyer. But, one would hope with each purchase you become a little wiser. Therefore, it's gotta be better than that last