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Measurements for both settings are on trek's site. For the bolt position, back is slack.

Considering the Rail 7 and 9.7, and just curious what thoughts are on the carbon frame being worth the extra $500. I also prefer the shimano drivetrain, and would probably switch to it on the 9.7 anyways. $500 for carbon is reasonable, but it seems with the pedal assist the money would be better...