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Thanks everyone.I haven't gathered my energy to negotiate with the local dealer.And if he isn't willing,then there are bigger Trek dealers in nearby towns. I used to have 170's- yes you get more...

Ah ha....I can tell already from emails to my bike shop guy that he doesn't want to switch out to a 165 for me. I will keep you posted....thanks for your info.

With further investigation, I found that the Di2 line comes in 165 crank lengths...but Trek sends out even their tiny bikes with 170's.I emailed Trek at their corporate contact from their website.I...

My 60 yr old thumbs are ready for easier shifting,,so I am probably buying Trek Silque,size 47. I have short little legs and old knees that do best with 165 cranks.It looks like there are no 165...